an ecologist observes a population of beetles that has arrived on an island from a nearby continent. compared to the continental population the island population are all very similar looking. what is the name of the effect he/she observed?
Answers
An ecologist observes a population of beetles that has arrived on an island from a nearby continent. compared to the continental population the island population are all very similar looking. The name of the effect he/she observed is Natural selection.
Natural selection is one process of evolution. More environment-adapted creatures have a higher chance of surviving and dispersing the genes that made them successful. As a result of this process, species evolve and diverge over time.
Natural selection is one theory for why there are so many species on Earth today.
With a co-publication on the theory in 1858, Charles Darwin (1809-1882) and Alfred Russel Wallace (1823-1913) are jointly credited with having developed it. Since the release of On the Origin of Species in 1859, Darwin has, however, generally eclipsed Wallace.
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Related Questions
You are presented with several single-celled organisms, including one thought to belong to the kingdom fungi. what unique feature could help you identify the fungus?
Answers
One unique feature that could help identify the fungus is the presence of chitin in its cell walls
Chitin is a complex polymer found in the cell walls of fungus that is not found in the cell walls of other single-celled organisms such as bacteria or protists. Furthermore, because fungi are heterotrophic creatures that absorb nutrients from their surroundings, they may be distinguished by their mode of feeding. Fungi have a unique way of reproduction that involves the formation of spores that may be distributed in the environment. Seeing any of these distinguishing characteristics may aid in identifying the organism as a fungus.
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Briefly explain emulsification
Answers
Explanation:
Emulsification is the process of breaking down the fat into smaller blood cells which makes it easy for enzymes to function and digest food. Fat emulsification helps digest fats into fatty acids and glycerol that are easily absorbed by the small intestine.
The primary purpose of which human organ system is to produce hormones that regulate body functions
Answers
This system includes the pituitary gland, thyroid gland, parathyroid gland, adrenal glands, tested/ovaries, and the pancreas.
State lab review packet answers diffusion through a membrane -beaks of finches - making connections - relationships and bio diversity
Answers
Answer:
Diffusion can happen with or without a membrane. It always takes place down a concentration gradient, which means the substance will diffuse from an area of higher concentration to an area of lower concentration.
Biodiversity is critical to maintaining the balance of the ecosystem. Without a diverse collection of organisms, the species in the environment cannot thrive and are at a risk of extinction in extreme cases.
Hope that answers the question, have a great day!
Genetic engineering is new technology that has only been around since the very early 2000's.
(True or false)
Answers
4. Two experiments were mentioned in the talk: one that tested food preference in caterpillars, and another that tested for egg-laying preferences in adult butterflies. What were the results of those two experiments, and what did those results imply
Answers
Jaap de Roode is a biologist that featured on TEDTalks so the query hyperlinks to him.
What happened to pathogen?The danger in the use of man-made medicinal drug whilst treating positive pathogens consists of an inclination for the pathogens to grow to be a resistant strain.
Just like humans, the monarch butterfly on occasion receives ill way to an uncongenial parasite. Monarchs survives with milkweed; their caterpillars devour milkweed vegetation only (Asclepias spp.), and monarch butterflies want milkweed to put their eggs.But biologist Jaap de Roode observed some thing thrilling approximately the butterflies he changed into studying - inflamed girl butterflies might select to put their eggs on a particular sort of plant that helped their offspring keep away from getting ill. How do they recognize to select this plant. Think of it as "the alternative butterfly effect"- that can train us to discover new drug treatments for the remedy of human disease.Read more about the experiments:
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Answer:
1st Experiment:
In the first experiment, they tested what food preference caterpillars had between the toxic milkweed and the non-toxic milkweed. The results of the experiment came out "boring" says De Roode. All of the caterpillars ate 50% of the non-toxic milkweed and ate 50% of the toxic milkweed.
2nd Experiment:
In the second experiment, they tested for egg-laying preferences in adult butterflies. They noticed that the adult butterflies laid 60% of their eggs in toxic milkweed and about 30% (the rest) on the non-toxic milkweed. The butterflies greatly preferred toxic milkweed to non-toxic.
(What the results imply)
These results imply that monarch butterflies self-medicate to help themselves and their babies to fight the diseases and parasites that they often are exposed to.
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Brainliest would be appreciated:))
1.Which mineral is NOT involved in generation of nerve impulses?
a. phosphorus
b. sodium
c. calcium
d. magnesium
Answers
The mineral that is NOT involved in the generation of nerve impulses is phosphorus. The correct option is a).
Nerve impulses, also known as action potentials, are electrical signals transmitted along the nerves to facilitate communication within the nervous system. The process of generating nerve impulses relies on the movement of ions, particularly sodium, calcium, and potassium.
Sodium plays a crucial role in depolarizing the nerve cell membrane, initiating the action potential. Calcium ions are involved in neurotransmitter release at the synapses, facilitating the transmission of the nerve impulse from one neuron to another.
Potassium ions are responsible for repolarizing the cell membrane, allowing the nerve cell to reset and fire subsequent impulses.
Magnesium, although an important mineral in various biological processes, does not directly participate in the generation of nerve impulses. It is involved in muscle relaxation, energy metabolism, and bone health. However, it does not have a direct role in the electrical signaling process of nerve impulses. The correct option is a).
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Which statement best describes the function of the
respiratory passageways of a human?
A) They permit digestive end-products to make
contact with body cells.
B) They permit exchange between the external
atmosphere and the circulatory system.
C) They transport gaseous cellular wastes from
body cells to the lungs for excretion.
D) They regulate the amount of ammonia and salt
dissolved in body fluids.
Answers
I need help. Write a short paragraph that compares the reproductive structures of gymnosperms and angiosperms
Answers
Answer:
Angiosperms are plants with flowers, gymnosperms are plants that do not have flowers. Both groups belong to spermatophytes or seed plants.Gymnosperms are seed-producing plants that do not possess flowers. In gymnosperms, the flowers are replaced by cones, which lack ovaries.
Explanation:
Briefly explain how the diagram to the right makes a good
model to represent the decay of a radioactive element.
You are encouraged to label the diagram.
You must use complete sentences.
Answers
An element's radioactive decay graph can be categorized as an exponential graph, more particularly, the decay of an element through exponential processes. As x increases exponentially in these graphs, y declines and gets closer to zero.
What is Radioactive Decay (Half Life) Equation?The centre of each atom, or nucleus, which accounts for the majority of an element's mass, is made up of a specific number of protons and neutrons. Even though every element has a unique nucleus, they are not always stable. Radiation is the name for the rays and particles that are emitted by unstable elements in an effort to stabilize their nucleus. As long as the element doesn't have a stable nucleus, this process, known as radioactive decay, continues on its own. Different substances breakdown at different speeds when they go through radioactive decay. Through the use of half lifetimes, these rates are measured. The duration of time before half of the nucleus disintegrates is known as a half-life, as its name would imply.How much of an element remains after a specific amount of time can be calculated using the following equation using half-lives:N\s= N ( 1 /2 ) n
Where N denotes the quantity of the element still present, N 0 is the quantity of the element at the beginning, and n denotes the number of half lives that have passed. By dividing the amount of time that has elapsed (t) by the duration of the half-life (T), one can determine the number of half-lives that have passed, even if this is unknown:n = t / T.
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which immunoglobulin type is found as a dimer form in mucous secretions, linked together by a joining chain protein and a secretory component?
Answers
The most common immunoglobulin isotype found on mucosal surfaces is secretory immunoglobulin A (IgA).
Two IgA molecules (dimeric IgA), a joining protein (J chain), and a secretory component make up secretory IgA. (SC).
Your immune system produces an antibody called immunoglobulin A (IgA). Mucous membranes, particularly those in the digestive and respiratory systems, contain IgA. Saliva, tears, and breast milk all contain it. A hereditary health condition called IgA deficiency can be handed down through generations.
IgA has long been considered a non-inflammatory antibody at mucosal locations. sIgA is concentrated in the mucus out layer [46] because of its polymeric structure and the oligosaccharide side chains of SC, which noncovalently cross-link microorganisms and encourage them to clump together in situ.
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Which statement describes crossing over as it occurs during meiosis?
Answers
The statement that describes crossing over during meiosis is crossing over is the exchange of genetic material between homologous chromosomes
What is meiosis ?Meiosis can be defined as a process where a single cell divides twice to produce four cells containing half the original amount of genetic information.
Therefore, During crossing over, two homologous chromosomes come together and exchange segments of genetic material. This occurs at specific regions called chiasmata. The result of crossing over is that each chromosome contains a unique combination of genes from both parents, increasing genetic diversity in the offspring.
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by what process did the blue dye penetrate the gelatin blocks
Answers
The process by which the blue dye penetrates the gelatin blocks is called diffusion. Diffusion is the spontaneous movement of molecules or particles from an area of higher concentration to an area of lower concentration, driven by the random movement of the particles.
In this case, the gelatin blocks act as a semi-permeable membrane, allowing smaller molecules of the blue dye to pass while enclosing larger molecules or particles. When a blue dye is applied to the surface of a gelatin block, the dye molecules initially concentrate in that area. Over time, the dye molecules begin to diffuse into the gelatin matrix and spread from areas of higher concentration to areas of lower concentration.
The rate of diffusion is influenced by several factors, such as the concentration gradient (difference in concentration between dye and gelatin), temperature, and particle size of the dye. As diffusion progresses, the dye molecules penetrate deeper and deeper into the gelatin block until an equilibrium is reached where the dye concentration is uniform throughout the block.
In summary, blue dye diffuses into gelatin blocks by a diffusion process in which dye molecules move from an area of higher concentration to an area of lower concentration until equilibrium is reached.
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The blue dye likely penetrated the gelatin blocks through a process called diffusion. Diffusion is the movement of molecules or particles from an area of higher concentration to an area of lower concentration.
In this case, the blue dye molecules, being in higher concentration in the surrounding liquid or solution, would naturally move and spread into the gelatin blocks where their concentration is lower.
Gelatin, which is composed of a network of interconnected molecules, provides a porous structure that allows the movement of small molecules, such as the blue dye, through its matrix. As the dye molecules come into contact with the gelatin, they can diffuse through the empty spaces between the gelatin molecules and gradually spread throughout the gelatin block.
The rate of diffusion is influenced by factors such as the concentration gradient, temperature, and the size of the dye molecules. A steeper concentration gradient and higher temperature generally promote faster diffusion. Over time, the blue dye molecules will continue to diffuse until an equilibrium is reached, where the concentration of dye is relatively equal throughout the gelatin block.
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Which event in Earth's history most directly allowed life to exist on land?
Answers
Answer:
Earth's temperatures increased, causing widespread evaporation. Earth collided with a large object, forming the moon. Single-celled organisms released oxygen into the air when they photosynthesized.
Answer:
Earth's temperatures increased, causing widespread evaporation. Earth collided with a large object, forming the moon. Single-celled organisms released oxygen into the air when they photosynthesized
Explanation:
An mRNA sequence reads: GAA/GCU/AUA/CUA/UGU. What would the effect on the amino acid be if the second codon read GCA instead, and the third codon read AAU ?
A) Silent mutation on both, no changes whatsoever.
B) Silent mutation on second codon, third amino acid changed from PHE to STOP
C) Silent mutation on AAU only. Third amino acid is now HIS
D) Silent mutation on second codon, third amino acid changed from ILE to ASN.
Answers
Answer:
D) Silent mutation on second codon, third amino acid changed from ILE to ASN.
Explanation:
Silent mutations are usually point mutation where you change one nucleotide. Since, the nucleotide changed is the third position, it does not affect the protein being manufactured (it will still put the amino acid Ala) [look up the codon redundancy on youtub.e to understand how awesome nature is!]
On the other hand, the other mutation introduced is Missense mutation where a different Amino acid is added due to change in codon (goes from ILE to ASN).
Euglena falls under what kingdom ?
Answers
Sea turtles dig holes on coastal
beaches and lay their eggs in the
hole. The mothers then retreat
back to the ocean. Based on this,
sea turtles could be considered
-selected.
A. K
B. S
C.
D. r
Answers
r-strategist are species that have large offsprings, but spend no time in parental care. Sea turtles can be considered exaples of r-strategist species.
What are r and k strategists?Species have different strategies to survive in different environments, reproduce, disperse, and compete. These strategies are r strategies and k strategies.
r strategist species have a high growth rate per capita, and low competition capabilities. This is why they can colonize new environments. But they can not compete with new-established species. r species are often displaced by k species.These species are mostly small-sized organisms with short life cycles. They reach sexual maturity early and have numerous descendants spending no time or energy in parental care.
k strategist species have a low growth rate per capita, but they are big competitors with the capacity of displacing other species and monopolizing the available resources.These are big-sized species that live for a long time, reaching sexual maturity in the advanced stages of their lives. They do not have numerous progenies, but they spend time parenting.
r and k strategies are closely related to reproductive strategies, habitat selection, and dispersion ability.
Considering this difference, we can assume sea turtles are r strategist.
They lay several eggs and leave them on the beach. They spend no energy in parenting. Even though they are buried, eggs are still in danger of being attacked by predators.When little turtles emerge, they have to manage to go to to the sea by themselves, being exposed to other predators.The strategy is to spend more energy in laying several eggs to increase survival probabilities, and less energy in parenting.
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Answer: D/r-selected
Explanation:
the bell-magendie law suggests that damaging the ventral roots of the spinal cord would lead to loss of
Answers
The bell-magendie law is a principle in neuroscience that describes the functional organization of the spinal cord. The Bell-Magendie Law suggests that damaging the ventral roots of the spinal cord would lead to loss of motor function.
According to this law, the dorsal roots of the spinal cord are responsible for sensory information, while the ventral roots are responsible for motor information. Therefore, damaging the ventral roots of the spinal cord would lead to a loss of motor function. This is because the ventral roots contain the axons of motor neurons, which innervate muscles and control movement. In contrast, damage to the dorsal roots would lead to a loss of sensory function, as they contain the axons of sensory neurons that transmit information from the body to the spinal cord and brain.
This law, proposed by Sir Charles Bell and François Magendie, states that the dorsal roots of the spinal cord are responsible for transmitting sensory information, while the ventral roots are responsible for transmitting motor information. If the ventral roots are damaged, the motor function will be affected as the transmission of motor signals from the spinal cord to the muscles is disrupted.
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State the monomers that the following polymers are made from:
a lipids (1 mark) b carbohydrates (1 mark) c proteins (1 mark)
Your small intestine is around pH 8, whereas your stomach is around
H 2. State and explain whether the types of protease enzyme
found in these organs are the same.
(3 marks)
Glucose is stored as the carbohydrate glycogen in the liver and
muscles. When extra glucose is needed, the glycogen is
Converted back into glucose. Explain simply how glycogen is
Synthesised and broken down.
(4 marks)
Answers
A lipid is made up of carbon and hydrogen, and carbohydrates are made up of glucose; the protein is made up of amino acids, the protease of the stomach is pepsin, and in the small intestine is pancreatic protease, while the glycogen is broken down when glucagon is present in the blood.
What is the significance of the stored glycogen?The glycogen polymer is made up of glucose and is stored in the liver and muscles and when the body requires it, the glucagon hormone is released and the glycogen is broken down into glucose; when it is not required, insulin is released into the blood and the glucose is converted back to glycogen.
Hence, a lipid is made up of carbon and hydrogen, and carbohydrates are made up of glucose; the protein is made up of amino acids, the protease of the stomach is pepsin, and in the small intestine is pancreatic protease, while the glycogen is broken down when glucagon is present in the blood.
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what is the effect in generael of changing the last base in a codon
Answers
The effect in generael of changing the last base in a codon is can change the amino acid that is produced during translation which known as a silent mutation.
Mutations are changes that occur in genetic material, both DNA and RNA, which occur at the gene or chromosome level, which can be passed on from parent to offspring.
Silent mutation is a change in a base pair in the gene at position 3 of the codon which results in a change in one genetic code. In some cases, changing the last base in a codon can lead to a different amino acid being produced, which can affect the structure and function of the protein. This is known as a "missense mutation." It is important to note that not all changes in the last base of a codon will have an effect on the protein, as some codons can code for the same amino acid.
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diferencia entre los tejidos vasculares xilema y floema
Answers
Answer:
El xilema es un tejido vascular que transporta agua y minerales disueltos absorbidos desde las raíces al resto de la planta. El floema es un tejido vascular que transporta compuestos orgánicos solubles preparados durante la fotosíntesis desde las partes verdes de la planta al resto de la planta.
Explanation:
What process MUST cells undergo
in order to replicate and make
copies of the cell and its DNA?
A. mitosis
B. nucleolus
C. cytokinesis
D. cytoplasm
Answers
Answer:
a
Explanation:
23. Infant monkeys raised with a nourishing wire mother and a nonnourishing cloth mother:a. shifted their initial preference for the wire mother to the cloth mother as they matured.b. preferred the nourishing wire mother.c. preferred the nonnourishing cloth mother.d. showed no preference for one mother over the other.
Answers
Infant monkeys raised with a nourishing wire mother and a non-nourishing cloth mother (c) preferred the non-nourishing cloth mother.
Monkeys belong to the primate order of the class Mammalia. They are considered to be highly social as animals. They are usually present in groups which is known as troop. They are usually herbivores. The smallest monkey in the world is Pygmy Marmoset monkey.
Cloth mother is the one who provides comfort and warmth to the child but us unable to provide nutrition. This phenomenon is mostly observes in monkeys where the mother that allows the child to cling on to her is called the cloth mother.
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Does natural selection occur when which of the following conditions are met?
Group of answer choices
Variations between individual organisms lead to differential survival chances.
The conditions in an ecosystem support a wide range of living organisms
Individual organisms depend on each other to obtain available resources.
Habitat and nutrient resources in an area are plentiful over a long period of time.
Answers
Answer:
THANKS FOR THE POINTS I WILL USE IT
Explanation:
Meat tenderizer contains an enzyme that interacts with meat. If meat is coated with tenderizer and then placed in a refrigerator for a short time, how would the enzyme be affected?
Answers
Answer:
The enzyme would be deactivated.
Explanation:
Enzymes are usually deactivated by low temperatures.
Enzymes are proteinous in nature, function by catalyzing biological reactions, and have a particular range of temperatures where they function optimally. Above these temperatures, the catalyzing attribute of enzymes gradually declines till they are denatured by high temperature and below the optimal temperature, their catalyzing attributes also decline. However, instead of being denatured by very low temperatures, they become deactivated instead.
Interstellar clouds of dust where stars form are known as
Answers
Answer:
Stars form inside relatively dense concentrations of interstellar gas and dust known as molecular clouds.
Explanation:
These regions are extremely cold (temperature about 10 to 20K, just above absolute zero). At these temperatures, gases become molecular meaning that atoms bind together.
Human blood types are determined by genes that fallow the codominance pattern on inheritance. There are two dominant alleles A and B and one recessive allele O
a) What is the genotype for heterozygous A __
b) What is the genotype for type O__
c) What genotype can be donate blood to anyone __
d) What genotype can receive blood from anyone __
Answers
Answer:
A - Ao
B - oo
C - oo
D - AB
Body Surface Area -adapted from the Redlarski’s paper (link)
Body surface area (BSA) plays a key role in several medical fields, including cancer chemother-
apy, transplantology, burn treatment and toxicology. BSA is often a major factor in the
determination of the course of treatment and drug dosage. A series of formulae to simplify
the process have been developed. Because easy-to-identify, yet general, body coefficient re-
sults of those formulae vary considerably, the question arises as to whether the choice of a
particular formula is valid and safe for patients. These empirical formulae are derived by
observing/fitting the experimental data and do not have a rigid model or reason explain-
ing their validity. In this problem, you will build a physics model to create your own BSA
equation other than using an empircal formula.
(a) Use a cylinder of height H and radius r as a approximation of the shape of a human.
Calculate the human’s body surface area(BSA), volume(V), and mass(M) in terms of
r and H. You may assume the density of human is 1000 kg/m3.
(b) Rewrite the surface area in in terms of height and mass.
(c) According to the equation you derived above, what is your body surface area? Is it the
same as the result calculated by using the empirical fomulae: BSA = √M H/C with
BSA in m2, M in kg, H in cm, and C=60 is a constant in this paper? If not, what is the percentage differences?
Note: percentage difference for two values E1 and E2 are |E1−E2|
(E1+E2)/2 ×100%.
(d) Considering the formula BSA = √MH/C with fixed H, plot a graph with BSA on
the y-axis and M on the x-axis. Explain what the trend/curve means.
(e) Considering the formula BSA = √MH/C with fixed BSA, plot a graph with H on
the y-axis and M on the x-axis. Explain what the trend/curve means.
(e) Considering the formula BSA = √MH/C with fixed BSA, plot a graph with H on
the y-axis and M on the x-axis. Explain what the trend/curve means.
Answers
a)Using a cylinder of height H and radius r as an approximation of the shape of a human, the surface area, volume, and mass are calculated in terms of r and H as follows:
Surface area (S) of a cylinder is 2πrh + 2πr², where h is the height, and r is the radius of the cylinder. In this case, the height of the cylinder is equivalent to the height of the human body. Hence;S = 2πrH + 2πr²Mass (M) of a cylinder is given by M = ρV, where ρ is the density of the cylinder, and V is the volume. Hence, the mass of a cylinder in terms of its radius and height isM = πr²HρVolume (V) of a cylinder is given by V = πr²H. Hence, the volume of a cylinder in terms of its radius and height isV = πr²H(b)The body surface area (BSA) of a human can be rewritten in terms of the height (H) and mass (M) as follows:
BSA = √(M/H C)We can rewrite it as H = M/ (BSA² C)Thus, H can be expressed as a function of M and BSA asH = M/(BSA² C)(c)If r = 0.15 m and H = 1.70 m, then using the equation, S = 2πrH + 2πr², the body surface area is given as:
S = 2π (0.15)(1.70) + 2π (0.15)² = 1.77 m²Using the empirical formula, BSA = √(MH/C) with M = 60 kg and H = 170 cm, we get BSA = 1.85 m²The percentage difference is given by;|E1 − E2| / (E1 + E2) / 2 × 100%where E1 = 1.77 m² and E2 = 1.85 m²Thus;|1.77 – 1.85| / (1.77 + 1.85) / 2 × 100% = 4.2%(d)Considering the formula BSA = √(MH/C) with fixed H, a graph with BSA on the y-axis and M on the x-axis can be plotted.The trend shows a non-linear increase in BSA as the mass increases.
(e)Considering the formula BSA = √(MH/C) with fixed BSA, a graph with H on the y-axis and M on the x-axis can be plotted.The trend shows a linear increase in height as the mass increases.
About HumanHuman are the most numerous and widespread primate species. They are a type of great ape that is characterized by a bipedal gait and capable cognitive abilities thanks to their large and complex brains. From the moment humans were created, somatic cell chromosomes have a total of 46 egg cells or sperm cells have only 23 chromosomes. The existence of fertilization returns the number of chromosomes of body cells to 46.
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The distortion (change in shape) of enzyme molecules which occurs at high temperatures is known as
Answers
If short hair (L) is dominant to long hair (l), then what fraction of the offspring produced by a cross of Ll x ll will have long hair
Answers
Answer:
The answer is 50%.
Explanation:
If we cross the two genotypes given in the question as Ll and ll, we can see that 50% of the offspring will have Ll as the genotype and the other 50% will have ll as the genotype.
Since L is the dominant gene, all the Ll genotypes will have long hair as a result of the dominant gene.
I hope this answer helps.