Indeed, in hindsight, it is true that many dams have produced more problems than they initially solved.
While dams have historically been constructed for various reasons such as flood control, water supply, irrigation, and hydroelectric power generation, their environmental and social impacts have become more apparent over time.
As a result, there has been a growing recognition of the need to remove certain dams to restore the ecosystem services provided by rivers.
The construction of dams often leads to the alteration of natural river flows, which can disrupt the natural hydrological patterns and impact the ecology of the river system. Dams can fragment river habitats, obstruct fish migration, and affect the reproductive cycles of aquatic species. Additionally, the impoundment of water behind the dam can lead to the loss of downstream sediment deposition, which is important for maintaining riverbeds, deltas, and coastal areas.
Furthermore, the reservoirs created by dams can cause the accumulation of organic matter, leading to the production of greenhouse gases such as methane, which contributes to climate change. Dams can also displace local communities, disrupt their livelihoods, and result in the loss of cultural heritage and historical sites.
In recent years, there has been a growing movement towards dam removal as a strategy to restore rivers and their ecosystems. Removing dams can help to restore natural river flows, improve water quality, and enhance habitat connectivity for fish and other aquatic organisms. It can also aid in the rejuvenation of riparian vegetation, revive floodplain ecosystems, and support the return of sediment deposition downstream.
However, it's important to note that dam removal is a complex decision that requires careful evaluation of the potential benefits and drawbacks. It involves considerations such as the ecological impacts, impacts on water supply and energy generation, potential for flooding, and the socio-economic implications for local communities. Each dam removal project needs to be assessed on a case-by-case basis, weighing the ecological benefits against the potential trade-offs.
In conclusion, the hindsight evaluation of dams has highlighted the problems they can create, leading to an increased focus on restoring ecosystem services by removing certain dams. While dam removal is not always the solution, it is now recognized as a valuable tool for mitigating the negative impacts of dams and restoring the natural functioning of river ecosystems.
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what is the most precise measurement of the volume of this liquid
Answer:
pipets
Explanation:
volumetric flask and granulated cylinders
what are the central assumptions of biological theories of crime?
Biological theories of crime are based on the assumption that biological factors, such as genetics, brain structure and function, and hormonal imbalances, play a significant role in the development of criminal behavior.
These theories suggest that certain biological traits or conditions may predispose individuals to engage in criminal behavior, either by increasing the likelihood of aggressive or impulsive behavior or by reducing the ability to inhibit such behavior.
Some of the central assumptions of biological theories of crime include the idea that criminal behavior is influenced by genetic factors, that brain abnormalities or dysfunctions may contribute to criminal behavior, and that hormonal imbalances, such as testosterone or cortisol levels, may be associated with aggression and violence. While these theories have generated significant debate and controversy, they continue to be an important area of research in criminology and psychology.
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A science researcher has developed a computer model of the process of DNA replication in a eukaryotic cell. The model includes the following sequence of bases in one strand of the DNA molecule. AACCTGGCCATGGACCTTTATATAAACTAGGAT The researcher wants to revise the model to show the transcription of DNA to form mRNA. Identify the choice that best completes the statement or answers the question. Which of these revisions to the model would be most useful for the researcher to include
Answer: Identify the promoter and the stop signal (terminator).
Explanation:
DNA is a molecule that contains the genetic information in all living things. This information is used for the synthesis of proteins that make up the body and carry out vital functions of the organism.
The DNA molecule consists of two strands that wind around each other to form a double helix structure, where each strand has a central part formed by sugars (deoxyribose in the case of DNA) and phosphate groups. The four basic components of DNA are nucleotides: adenine (A), thymine (T), guanine (G) and cytosine (C). The nucleotides are joined together (A to T and G to C) by chemical bonds and form base pairs that connect the two strands of DNA. Depending on the sequence of nucleotides (which have different bases), different proteins are synthesized.
DNA replication consists of synthesizing another identical DNA molecule, using enzymes called polymerases, which are molecules specifically dedicated only to copy DNA. Transcription, on the other hand, is the process by which a copy of messenger RNA (mRNA) is generated from the sequence of a gene in the DNA. This RNA molecule leaves the cell nucleus and enters the cytoplasm, where it directs protein synthesis (a polymer made up of many amino acids).
Protein synthesis, or translation, involves translating the sequence of an mRNA molecule into an amino acid sequence during protein synthesis. The genetic code describes the relationship between the sequence of base pairs in a gene and the corresponding sequence of amino acids it encodes. To begin translation, a start codon (set of 3 bases) must first be identified, which is usually AUG that also codes for the amino acid methionine. Then, the codons that follow are read and the corresponding amino acids are added according to the genetic code. The transfer RNA (tRNA) is complementary to the anticodon at specific codons in the messenger RNA and carries the amino acid coding for the codon. In addition, ribosomal RNA (rRNA) is an RNA that is part of ribosomes and is essential for protein synthesis in all living things. rRNAs form the framework of ribosomes and associate with specific proteins to form ribosomal pre-subunits. To finish the translation, a termination codon has to be read, which can be UGA, UAG or UAA.
To revise the model to show transcription to form mRNA, the research should identify the promoter and the stop signal. The promoter is a DNA sequence required to turn a gene on or off. The transcription process starts at the promoter which is usually located near the beginning of a gene and has a binding site for the enzyme that is used to make a messenger RNA (mRNA) molecule. The enzyme RNA polymerase will keep doing the transcription until it reaches a sequence of DNA that is signal which indicates it should stop. This process is called termination, and it happens once the enzyme reaches this sequence, called terminator.
Belle ran a total of 510 meters directly toward school at a constant velocity. She ran one-third
of that distance in 85 seconds. What was her velocity?
HELP ASAP PLZZZ BEING TIMED
Answer:
Explanation:
her velocity was 90kph
For substances to enter or leave a cell, molecules must pass through
the nucleus.
the Golgi apparatus.
the ribosomes.
the cell membrane.
Answer:
The cell membrane/plasma membrane.
Answer:
cell membrane
Explanation:
A researcher is designing an experiment to see if a new drug will lower the blood pressure of rats. He uses a double blind design and in addition to giving some of the rats the new drug, some others are given vasopressin, a hormone that is known to lower blood pressure. Why include vasopressin
A researcher is designing an experiment to see if a new drug will lower the blood pressure of rats. He uses a double blind design and in addition to giving some of the rats the new drug, some others are given vasopressin, a hormone that is known to lower blood pressure.
The inclusion of vasopressin in the experiment by the researcher is to act as a positive control in the experiment and to validate the reliability of the experiment.A positive control is a treatment that has a known effect on the dependent variable. This treatment helps to test whether the experimental design is appropriate and whether the expected changes in the dependent variable are appropriately detected by the methods used. In the current experiment, vasopressin has been used as a positive control as it is known to lower blood pressure in rats. So, by giving vasopressin to some of the rats, the researcher will observe the changes in blood pressure that result from the treatment, and this will help him/her to evaluate the effectiveness of the new drug. In conclusion, the use of a positive control like vasopressin in this experiment will help to ensure that the results obtained are valid, reliable, and can be attributed to the new drug and not any other confounding factors.
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Question: What do you know about animal production, processing,
marketing, and breeding?
Answer:
sex
Explanation
they have to sexual intercourse to produce a baby
Answer:
production produce marketing and breeding because they also born baby and processing foods also in there part of body
Explanation:
little bit only I don't know so much if you think the answer is correct then it ok
what allows oxygen to pass into your blood?
branliest.
Answer:
The alveoli are responsible for receiving oxygen and transferring it to the blood. The alveoli are surrounded by capillaries, which are tiny blood vessels. Both the alveoli and the capillaries have very thin walls, allowing oxygen to travel from the alveoli to the blood.
the polymerase chain reaction (pcr) amplifies dna by means of repeated rounds of dna replication. this means that the ends of the amplified fragments in pcr become shorter with every round of replication. group of answer choices true false
By several iterations of DNA replication, the polymerase chain reaction (pcr) amplifies DNA. This indicates that with each replication cycle, the ends of the amplified fragments in pcr shorten. False.
In PCR, a section of the genome to be amplified is chosen using short synthetic DNA fragments called primers. Several rounds of DNA synthesis are then used to amplify that segment. A laboratory procedure called PCR, or polymerase chain reaction, is used to replicate a DNA fragment several times.
A specific DNA target may be amplified, or copied, using the highly accurate PCR method from a mixture of DNA molecules. Taq DNA Polymerase plays a crucial part in the synthesis and amplification of new DNA strands, making it crucial to Polymerase.
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what is the form of rna that carries the code from the dna molecule to the site where the polypeptide or protein is assembled?
Messenger RNA (mRNA) is the type of rRNA that carries the code from the DNA molecule to the site where the protein or polypeptide is synthesized.
What is the process of synthesis of mRNA?
Transcription is the process of copying a segment of DNA into mRNA in the presence of an RNA polymerase enzyme. It carries the DNA genetic information used to encode a protein.
What is the process of synthesis of protein?
Translation is the process of synthesis of protein where the information encoded in messenger RNA directs the addition of amino acids during protein synthesis.
Through the process of RNA splicing introns (noncoding sequences) are removed from the pre-mRNA and leaving exons (encode the protein). The mature mRNA before the completion of splicing enters into the cytoplasm where it was modified by the process of capping and tailing.
Capping involves the addition of unusual nucleotide methyl guanosine triphosphate to the 5 prime ends of the heterogeneous nuclear RNA.
Tailing involves the addition of adenylate residues to the 3 prime end of the hn RNA in a template-independent manner.
These processes are required to protect the RNA from nucleases.
Hence mRNA formed in transcription carries genetic code to the small unit of ribosome where the proteins are assembled.
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how does precipitation affect tropical rainforest
Answer:
Rainforests affect the local weather conditions by making more rainfall and medium temperatures. It is also important for it's plants to thrive and animals who live in the rainforests.
Explanation:
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C. Shoot - Answer questions
1. What is biodiversity ?
Answer:
the variety of life in the world or in a particular habitat or ecosystem.
Explanation:
Biodiversity is the variety and variability of life on Earth. Biodiversity is typically a measure of variation at the genetic, species, and ecosystem level. Terrestrial biodiversity is usually greater near the equator, which is the result of the warm climate and high primary productivity.
FILL IN THE BLANK. if a rational function is proper, then _______ is a horizontal asymptote.
if a rational function is proper, then y=0 is a horizontal asymptote.
A rational function's horizontal asymptote can be found by examining the degrees of the numerator and denominator. If N is the numerator's degree and D is the denominator's degree, and N D, then the horizontal asymptote is y = 0. Divide the numerator by the denominator to obtain the asymptote. The equation for the slant asymptote is the quotient.
A horizontal asymptote is a parallel line to which a portion of the curve is very close. However, a HA should never contact any section of the curve (but it may cross the curve). Example: Determine the horizontal asymptote of the function f(x) = 2x / 2. (x - 3). So y = 2 is the HA of the function.
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What,generally, is the current level of deforestation in the United States? In developing nations? How would you expect the deforestation in developing nations to change in the next 100 years? Explain.
The current level of deforestation is increased. This is due to the fact that the industrial revolution has taken its place, and wood is one of the main reasons for deforestation.
What is deforestation?The large-scale removal of trees from forests (or other places) to make way for human activity is known as deforestation.The deliberate clearance of forested terrain is known as deforestation.
Forests have been cleared throughout history and into the present era to make room for agriculture and animal grazing as well as to obtain wood for fuel, manufacture, and construction. Around the world, deforestation has significantly changed the terrain.
Therefore, the rate of deforestation is rising at the moment. This is because the industrial revolution has replaced it, and wood is now one of the primary causes of deforestation.
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certain lizards display a survivorship curve where the chance of survival is independent of age. which line on the graph best depicts the survivorship of these lizards?
The survivorship curve that best depicts the survivorship of lizards that display a chance of survival independent of age is a type II survivorship curve. In this type of curve, the mortality rate is constant throughout the life span of the individual, indicating that the chance of survival is not influenced by age.
Type II survivorship curves are often observed in species that have relatively constant levels of predation, disease, or other environmental factors that affect mortality rates equally at all ages. Overall, this suggests that these lizards have a relatively stable mortality rate throughout their life span, regardless of their age.
The line on the graph that best depicts the survivorship of certain lizards, where the chance of survival is independent of age, would be a Type II survivorship curve. In a Type II curve, the mortality rate remains constant throughout the entire lifespan of the species. This means that individuals have an equal probability of surviving at any given age, which is a characteristic of these particular lizards.
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I need help ASAP as possible! Please!
Describe how water molecules would be likely to arrange themselves if they were near other water molecules? If they were near other polar molecules? If they were near non-polar molecules?
When water molecules are arranged near other water molecules, they arrange themselves so that the oxygens are positioned near hydrogens on other molecules and they strongly stick together.
When water molecules are arranged near other polar molecules, they strongly interact with the other polar molecules that have partial charges, allowing them to dissolve many different materials like salts and many organic compounds. When arranged in this way, they stick strongly to each other.
When water molecules are arranged ear non-polar molecules, they are not electrostatically attracted to these water molecules, so they stay separate and do not stick together.
What are water molecules?A water molecule consists of two atoms of hydrogen linked by covalent bonds to the same atom of oxygen. Water is a molecule because it contains molecular bonds.
Water is also a compound because it is made from more than one kind of element.
Due to the electronegativity difference between oxygen and the hydrogen atoms in water, water molecules have a partial negative charge on oxygen and a partial positive charge on the hydrogen atoms. Hence, water molecules are polar and hydrogen bonds occur between oxygen and hydrogen atoms of adjacent water molecules.
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On what islands did Charles Darwin do his study on biodiversity?
How many genes make up the human genome four adenine thymine guanine and cytosine 23 pairs of genes 20000 25000 genes billion genes?
Genes are the hereditary units, which are present in the coded segments of the DNA. Genes carry the information from parent to daughter cells.
There are 20,000 to 25,000 genes that make up the human genome.
Human Genome Project was conducted for several years, the result obtained was:
The human genome project was an international scientific project, which aimed at determining the base pairs that make up the human DNA.
The project estimated that humans consist of 20,000 to 25,000 genes in their genome. Each individual inherits the copies of genes from both parents.
Therefore, the correct answer is Option C.
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A pond contains guppies, cichlids, and freshwater crabs. The collection of all of theguppies and no other species is considered a:1. Population2. Biosphere3. Community4. Ecosystem
A population is a group of organisms of the same species that live in the same place.
A community is a group of populations that live in the same place.
An ecosystem is the interaction of biotic and abiotic factors in one delimited area.
The biosphere is the global ecosystem.
Because the guppies are organisms of the same species, they are a population.
true or false: binary fission is considered asexual reproduction. if false, make it a correct statement.
This statement is true because Bacteria and other prokaryotes lack membrane-bound nuclei like the nucleus. The prokaryotic DNA is reproduced before binary fission so that each of the prokaryotic progeny.
Why is binary fission?Binary fission is a kind of asexual reproduction in biology where a group consists of two sister chromatids, each of which has the capacity to increase in size to that of the original cell. Asexual refers to a type of reproduction that doesn't need sex cells (gametes).
Which living things employ binary fission?Simple cell division into two is known as binary fission. It is mostly used by prokaryotic species like bacteria and archaea. However, certain eukaryotic protists also utilise it. Asexual reproduction known as binary fission produces children that are dna clones of their parents.
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Which of the following is an example of phagocytosis? : A cell takes in large amounts of water. A cell in the thyroid gland secretes a product to the outside. the sodium-potassium pump uses ATP energy to move ions. An amoeba wraps its membrane around a small unicellular organism to eat it.
Answer:
An amoeba wraps its membrane around a small unicellular organism to eat it.
Explanation:
Description of carbohydrates and what is it purpose and importance
Carbohydrates are essential molecules whose main importance is being a source of energy for the organism. Carbohydrates are also components of the cell membrane.
What are carbohydrates?
Carbohydrates are essential molecules for life as they are the main source of energy necessary for organisms. They are also part of the cell membrane when binding to lipids and proteins and composing glycolipids and glicoproteins.
Carbohydrates are hydrophilic substances soluble in water and alcohol. Their -OH groups are responsible for that solubility.
Carbohydrates are present as small or large molecules.
• Small molecules ⇒ sugars ⇒ monosaccharide and disaccharide
• Large molecules ⇒ polysaccharide
Glucose is the principal carbohydrate cells use to accomplish their vital functions.
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The primary function of the kidney is to exchange molecules across a membrane between the blood and the urine. One type of kidney cell has a basic rectangular shape, except for a single surface, which is lined with tiny, finger-like projections that extend into the surrounding extracellular space. Which of the following best explains the advantage these projections provide the cell? The projections increase the volume of the cell without affecting the surface area, which increases the metabolic needs of the cell. B The projections increase the surface area-to-volume ratio of the cell, which allows for more efficient nutrient exchange with the environment. The projections increase the speed at which an individual molecule can move, resulting in faster nutrient Which of the following best explains the advantage these projections provide the cell? A The projections increase the volume of the cell without affecting the surface area, which increases the metabolic needs of the cell. B The projections increase the surface area-to-volume ratio of the cell, which allows for more efficient nutrient exchange with the environment. The projections increase the speed at which an individual molecule can move, resulting in faster nutrient exchange with the environment D The projections increase the selectivity of the membrane because the small size of the projections limits the number of transport proteins that can be embedded in the membrane.
Answer:
The answer is B: The projections increase the surface area-to-volume ratio of the cell, which allows for more efficient nutrient exchange with the environment.
Explanation:
These finger-like projections, also known as microvilli, are commonly found in cells that are actively involved in absorption or secretion, such as the kidney cells in this scenario. They significantly increase the surface area of the cell, thereby allowing more transport proteins to be embedded in the cell membrane and facilitating more efficient exchange of molecules between the cell and its environment. This increase in surface area doesn't significantly affect the volume of the cell, so it doesn't considerably increase the metabolic needs of the cell.
Therefore, these projections do not primarily increase the volume of the cell (option A), the speed of individual molecule movement (option C), or the selectivity of the membrane by limiting the number of transport proteins (option D). Instead, they enhance the cell's capacity for molecular exchange by increasing its surface area.
Drag and drop each tissue or structure to the germ layer from which it is derived. Ectoderm Mesoderm Endoderm red blood cells central nervous system notochord kidney tubule cells thyroid follicular cells epidermis peripheral nervous system lung alveolar cells pancreatic acinar cells skeletal muscle
Ectoderm: central nervous system, peripheral nervous system, epidermis Mesoderm: notochord, kidney tubule cells, skeletal muscle Endoderm: red blood cells, thyroid follicular cells, lung alveolar cells, pancreatic acinar cells
I'll list the germ layers and their corresponding tissues or structures:
Ectoderm:
- Central nervous system
- Epidermis
- Peripheral nervous system
Mesoderm:
- Red blood cells
- Notochord
- Kidney tubule cells
- Skeletal muscle
Endoderm:
- Thyroid follicular cells
- Lung alveolar cells
- Pancreatic acinar cells
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This accessory organ of the skin is composed primarily of dead, keratinized cells.skinhairnailsmelanin
The accessory organ of the skin composed primarily of dead, keratinized cells is the nails. Nails are made of a protein called keratin and provide protection for the tips of our fingers and toes.
Keratin is a fibrous protein that is a major component of hair, nails, and the outermost layer of skin in humans and other mammals. It is a tough, insoluble protein that provides strength and protection to these structures.
Keratin is produced by cells called keratinocytes, which are found in the skin, hair follicles, and nails. These cells synthesize keratin and then die, leaving behind a tough, waterproof layer of keratin protein that provides a barrier against the environment.
Keratin is also used in various cosmetic and hair care products to help strengthen hair and nails. It is commonly found in shampoos, conditioners, and hair treatments that claim to improve the health and appearance of hair.
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The accessory organ of the skin composed mostly of dead; keratinized cells is the hair. Hair originates from the hair follicle, exists as the hair shaft on the skin surface, and as the hair root underneath the skin surface. Other accessory structures of the skin include nails, sweat glands, and sebaceous glands.
Explanation:The accessory organ of the skin composed primarily of dead; keratinized cells is the hair. Hair is a keratinous filament growing out of the epidermis made mostly of dead, keratinized cells. Strands of hair originate in an epidermal penetration of the dermis called the hair follicle.
The hair that is not anchored to the follicle, and much of which is exposed at the skin's surface, is known as the hair shaft. The rest of the hair, anchored in the follicle underneath the skin surface, is called the hair root, which ends deep in the dermis at the hair bulb. The hair bulb includes a layer of mitotically active basal cells, known as the hair matrix.
Accessory structures of the skin, apart from hair, also include nails, sweat glands, and sebaceous glands. Like hair, nails are also composed of dead, keratinized cells and serve to protect the extremities of our fingers and toes from mechanical damage. Sweat glands and sebaceous glands have other key homeostasis roles, such as cooling the body surface when overheating and acting as a natural moisturizer, respectively.
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Help i only got 5 minutes!!!!! 2 questions. 1.) how has our understanding of cells changed since the 1800s?___________________________________________________________________________________________________________________________________________________________________________________________________________.2.)Compare the functions of cells to the characteristics of life._______________________________________________________________________________________________________________________________________________________________________________________________________.
Answer: The answer is below:
Explanation:
QUESTION 1: The modern version of the cell theory includes several new ideas that reflect the knowledge that has been gained since the mid-1800s. These include the knowledge that energy flows within cells, hereditary information is passed from cell to cell, and cells are made of the same basic chemical components.
QUESTION 2: The three parts of the cell theory are as follows: (1) All living things are made up of cells, (2) Cells are the smallest units (or most basic building blocks) of life, and (3) All cells come from preexisting cells through the process of cell division.
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Help....I will mark as brainless if answered correctly
Although the birds of the Galapagos Islands looked very different from one another structurally, they all shared
something in common. What was the common thread?
A. They were all carnivores.
B. They were all nocturnal.
C. They were all different variations of the finch.
Answer:
I believe the answer is C. They were all different variations of the finch.
Explanation:
Although the birds of the Galapagos Islands looked very different from one another structurally, they all shared something in common. What was the common thread? They were all different variations of the finch.
Answer: C. They were all different variations of the finch.
Explanation:
What is the ultimate purpose of the nuclear reaction in a nuclear power plant
Answer:
I heats water to produce steam thar spins a turbine.
the picture shows a venus's flytrap. this unusual organism can trap flies with its leaves, but it gets most of its food from photosynthesis. to what kingdom does this organism belong?
The Venus flytrap, a little perpetual spice, is one of the most generally perceived flesh-eating plant species on The planet.
Like all plants, the Venus flytrap gets its energy from the sun in a cycle called photosynthesis. It digests bugs and 8-legged creatures to get supplements that are not accessible in the general climate.
In spite of the fact that the Venus Flytrap eats bugs, it can deliver its own food also. Subsequently, it isn't solely heterotrophic. Then again, all creatures and parasites are heterotrophs and consequently follow the heterotrophic method of nourishment. Q.
At the end of the day, the Venus flytrap decimates bugs! This is extraordinarily surprising for a plant, as most plants make their own food through photosynthesis. This is an interesting illustration of the cooperative relationship, "predation," among plants where the plant is the hunter!
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do different colors of light affect the direction of a growth plant
hypothesis:
scientific question:
Explanation:
A common question is: Does the color of light affect plant growth? The color of light DOES affect plant growth, but the effect is more noticeable under low light intensity. Red & blue light are most effective for plant growth, while yellow & green have minimal effect. UV light can damage plants, ca