4 friends are talking about stars. this is what they said: ali: all objects that shine in the sky at night are stars. ram: only the sun and the moon are stars because they are bright. jack: only objects in the sky that give out their own ligh are stars. mehrab: only the sun is a star. who is correct?
Answers
Out of the four friends, Mehrab is correct. He states that only the sun is a star, which is accurate.
Stars are celestial bodies that emit their own light and energy through nuclear fusion. The sun, being a massive ball of hot, glowing gases, fits this definition perfectly.
Ali's statement that all shining objects in the night sky are stars is incorrect. While there are many objects that can be seen in the night sky, such as planets, satellites, and even airplanes, not all of them are stars.
Ram's statement that only the sun and the moon are stars because they are bright is also incorrect. The moon is not a star; it is Earth's natural satellite, reflecting the sun's light.
Jack's statement that the only objects in the sky that give out their own light are stars is partially correct. Stars do give out their own light, but not all objects that give out light in the sky are stars. For example, planets like Venus and Jupiter reflect the sun's light and can appear bright in the night sky, but they are not stars.
In summary, out of the four friends, Mehrab is correct in stating that only the sun is a star.
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Related Questions
some species of animals and plants are currently responding to climate change by extending their range into new territories. True or False
Answers
The claim that some animal and plant species are currently expanding their range into new areas in response to climate change is True.
What impact does climate change have on plants and animals?Among other things, vegetation, food supplies, and water availability are all impacted by rising temperatures. Ecosystems might become incapable of supporting some species, forcing animals to migrate outside of their usual ranges in search of food and suitable living conditions and leading to the extinction of other species.
How is climate change affecting animals?Numerous challenges to wildlife have been brought on by climate change in all of our parks. Due to changes that result in less food, less successful reproduction, and interference with the environment for local wildlife, rising temperatures reduce the survival rates of many species.
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What does abiotic mean?
A. living
B. synthetic
C. non-living
D. polymer-based
Answers
Answer:
C
Explanation:
Non Living I Belive
Answer:
i think it is letter C
Explanation:
Negative feedback loops:
a. decrease rate
b. increase rate
c. reverse change
d. reinforce change
Answers
Answer:
the answer would be c
Explanation:
hope it helped
rank these items from most acidic to least acidic. to rank items as equivalent, overlap them.
pH = 14 ; [H3O+] = 10^-16 ; pH = 3 ; [H3O+] = 10^-2 ; pH = 5
Answers
pH = 3 ; [H3O+] = 10^-2, pH = 5, pH = 14 ; [H3O+] = 10^-16. These items are ranked from most acidic to least acidic. To rank items as equivalent, they are overlapped.
The pH scale is a measure of acidity, with lower pH values indicating higher acidity and higher pH values indicating lower acidity. The pH of a solution is defined as the negative logarithm of the hydrogen ion concentration ([H3O+]).
So, a pH of 3 corresponds to a hydrogen ion concentration of 10^-3 moles/liter, which is more acidic than a pH of 5, which corresponds to a hydrogen ion concentration of 10^-5 moles/liter. Similarly, pH 14 corresponds to a hydrogen ion concentration of 10^-14 moles/liter, which is less acidic than pH 5.
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which of the following statements is true of linked genes?multiple choice question.they do not assort independently and do not produce mendelian ratios for crosses tracking two or more genes.they do assort independently but do not produce mendelian ratios for crosses tracking two or more genes.
Answers
The correct statement is: They do not assort independently and do not produce Mendelian ratios for crosses tracking two or more genes.
Linked genes are genes that are located close to each other on the same chromosome.
Unlike genes that are located on different chromosomes, linked genes tend to be inherited together as a result of their physical proximity. This means that they do not assort independently during meiosis, breaking the principle of independent assortment proposed by Gregor Mendel.
When two or more genes are linked, their inheritance does not follow the expected Mendelian ratios observed for unlinked genes.
In Mendelian genetics, genes located on different chromosomes segregate independently into gametes and produce predictable ratios in offspring.
However, linked genes tend to stay together and are less likely to undergo recombination, resulting in deviations from Mendelian ratios in crosses involving multiple linked genes.
The phenomenon of genetic linkage and its impact on inheritance was one of the key discoveries in genetics that provided evidence for the existence of chromosomes and helped develop the concept of genetic mapping.
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Which is one basic assumption of the heterotroph hypothesis?
(1) More complex organisms appeared before less complex organisms.
(2) Living organisms did not appear until there
was oxygen in the atmosphere.
(3) Large autotrophic organisms appeared before small photosynthesizing organisms.
(4) Autotrophic activity added oxygen molecules to the environment
Answers
Oxygen molecules were added to the environment through autotrophic activity. The origin of life on Earth is explained by the heterotroph hypothesis.
The heterotrophic hypothesis is what?According to the so-called heterotrophic hypothesis, life originated from an organic soup of tiny molecules either transported to Earth by alien objects or created through gas-gas reactions caused by lightning.
What is the evolutionary heterotroph hypothesis?The heterotroph hypothesis states that the first cells were likely heterotrophic and would have devoured organic molecules created in the absence of cells. These cells would have required to produce energy through a process known as fermentation.
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the owl in this diagram is considered to be a
carnivore
scavenger
omnivore
herbivore
Answers
Answer: carnivore
Explanation:
To answer this question, we need to define the given answers and look at what the owl eats via the diagram. Then we will decide what the owl is considered to be.
Here are simple definitions for the given answers:
Carnivore: eats only animals
Scavenger: eats dead organisms
Omnivore: eats both plants and animals
Herbivore: eats only plants
Next, we will look at what the owl eats via the diagram. See attached. The owl eats frogs, snakes, squirrels, rabbits, and mice (these might not be the exact animals, I am assuming based on the picture). All of these are animals that appear to be alive, meaning the owl is a carnivore.
Genetic engineering is the scientific process of changing the genome of an organism for specific purposes. Which genetically engineered food crop would have the greatest positive impact on the health of people in developing nations? rice that resists drought tomatoes that will ripen slowly cotton that is resistant to insect pests carrots that can be grown in cool temperatures
Answers
Answer: rice that resists drought
Explanation:
The genetic engineering is a process of developing healthy plants and crops. This enable the production of disease free, drought tolerant, and high yielding crops. Also, the crops can be grown in different seasons.
The genome of the plant is manipulated with that of the other plant or animal to develop desired characteristics in plants.
The rice that resists drought is the correct option. This is because the rice is the basic staple crop. It is consumed by people all over the world. It is consumed on the daily basis. The rice crops grow in the standing water, in the absence of appreciable amount of water rice may not grow. Thus, attaining resistance to drought in rice plants, will have a greatest positive impact on the health of the people of the developing nations. As more production of rice will enable people to obtain daily food.
Which statement is factual?
a. Asexual reproduction produces offspring that are identical to the parent.
b.Sexual reproduction allows for diploid gametes to combine to increase genetic variation.
c.Asexual reproduction leads to the formation of haploid gametes.
d.Sexual reproduction does not require the production of gametes.
Answers
Answer:
a
Explanation:
What is the difference between a eukaryote and a prokaryote in terms of what they have within in them?
Answers
Answer:
The primary distinction between these two types of organisms is that eukaryotic cells have a membrane-bound nucleus and prokaryotic cells do not. ... The nucleus is only one of many membrane-bound organelles in eukaryotes. Prokaryotes, on the other hand, have no membrane-bound organelles.
Which neurotransmitter stimulates skeletal muscle cells to contract but slows contractions of the heart?.
Answers
The neurotransmitter that stimulates skeletal muscle cells to contract but slows contractions of the heart is acetylcholine.
Neurotransmitters are chemical messengers that are produced inside the neuron and play a role in the nervous system to transmit messages from nerve cells to the targetted cells.
Acetylcholine is synthesized from acetyl-CoA and choline by the cholinergic neurons. Acetylcholine stimulates muscle cell contraction by binding to its receptors on muscle fibers which results in the opening of the sodium channels so that sodium ions can enter the cell which eventually results in contraction.
The muscarinic M2 receptors present in the heart slow down the heart rate by decreasing the rate of depolarization. Acetylcholine binds to these receptors and activates them which results in decreased contractions of the heart.
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Which of the following names the three main parts of a human cell?
A. cytosol, nucleus, and membrane
B. mitochondria, lysosome, and centriole
C. plasma membrane, mitochondria and nucleus
D. cytoplasm, plasma membrane, and nucleus
Answers
The three main parts of a human cell are: cytoplasm, plasma membrane, and nucleus so the correct answer is option (D).
Cytoplasm: The cytoplasm is the gel-like substance that fills the cell. It is composed of various organelles, cytosol (the fluid portion), and other cellular structures. The cytoplasm houses many cellular activities and provides support to the organelles within the cell.
Plasma membrane: The plasma membrane, also known as the cell membrane, is the outermost boundary of the cell. It acts as a protective barrier and regulates the passage of substances in and out of the cell. The plasma membrane is made up of a phospholipid bilayer embedded with proteins and other molecules.
Nucleus: The nucleus is often referred to as the control center of the cell. It contains the cell's genetic material, DNA, which carries instructions for cell growth, reproduction, and functioning. The nucleus is surrounded by a nuclear envelope and contains a nucleolus, which is involved in the production of ribosomes.
While the other options may mention important cellular components, they do not encompass the three main parts of a human cell as specified in option D.
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The three main parts of a human cell are the cytoplasm, the plasma membrane, and the nucleus. The cytoplasm holds other cellular components, the plasma membrane controls passage of substances, and the nucleus contains DNA that controls cell functions.
Explanation:The three main parts of a human cell are named in option D: cytoplasm, plasma membrane, and nucleus. The cytoplasm is the cell's fluid that fills the cell and holds the other cellular components. The plasma membrane, also known as the cell membrane, is a protective barrier that controls the passage of substances in and out of the cell. The nucleus is the cell's control center, containing DNA that dictates the cell's functions and behavior.
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Catalysts at Work
Imagine you are in a laboratory. You are exploring
the following reaction: A + B → C
When the product C is created, bubbles form.
When 10mL of A is added to 10mL of B, the
reaction takes twenty seconds. Your teacher gives
you three unknown substances (X, Y, and Z), one
of which is a catalyst for the reaction.
Design an experiment to test substances X, Y, and
Z to determine which one is a catalyst for the
reaction.
DONE ✔
10 of 15
Answers
To figure out which is the catalyst, create three test tubes and add the unknown compounds X, Y, and Z to each one. The reaction that produces C significantly faster than the original reaction A + B ⇒ C will be the catalyst.
A catalyst is any substance that accelerates the rate of a reaction without being consumed.
Therefore, to identify which unknown substance is a catalyst, the following experiment can be done:
Prepare three test tubes each containing reactant A and reactant B.Now add the unknown substance X to the first test tube.Similarly, add unknown substance Y to the second test tube and unknown substance Z to the third test tube.Record the time for each reaction until the bubbling stops.Examine each test tube and observes which one completes the reaction the quickest and which one stops producing bubbles fastest.Therefore, the test tube that stops producing bubbles first, contains the catalyst.
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DNA and RNA both use the same types of nucleotides
Answers
Answer:
No
Explanation:
In the nucleotide of DNA and RNA only Phosphate that is similar to both nucleic acid, They have different sugar portion and Nitrogenous base.
DNA nucleotide include
- Phosphate
- deoxyribose sugar
- NB Adenine, Thymine, Guanine and Cytosine
RNA nucleotide include
- Phosphate
- Ribose sugar
- NB Adenine, Uracil, Guanine and Cytosine
Therefore They do not use the same types of nucleotides because DNA has 2 strand that are joined together by weak hygrogen bond and it is long. while RNA has 1 strand and it is a short thus not coiled or helical.
Select the correct answer.
Which organ connects the kidney to the urinary bladder?
A.
gallbladder
B.
rectum
C.
renal pelvis
D.
ureter
E.
urethra
Answers
While observing skeletal muscle tissue under the microscope you note that it appears striated. You tell your lab partner this is because ______.
Answers
While observing skeletal muscle tissue under the microscope you note that it appears striated. You tell your lab partner this is because the skeletal muscle cells have striped or striated appearance which is due to the overlapping of the contractile proteins, actin and myosin that are present within the muscle fibers.
In addition, striations or striated appearance are also present in the cardiac muscle tissue, but this does not appear in the smooth muscle tissues.However, when we look at a skeletal muscle under a microscope, we can see alternating light and dark bands that run perpendicular to the long axis of the muscle fiber. This gives the muscle fiber the striated appearance. The striated appearance of skeletal muscle is due to the arrangement of contractile proteins (myofilaments) in the muscle fiber. It is due to the alternating arrangement of thin (actin) and thick (myosin) filaments within the muscle cell. The actin and myosin filaments overlap at a region called the A-band, giving it a darker appearance. The region between two adjacent A-bands is called the I-band, which appears lighter in color. Therefore, the striated appearance is due to the specific arrangement of actin and myosin filaments in the skeletal muscle cells.
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What organelles make and package proteins?
Answers
Answer:
The organelles that make and package proteins are ribosomes and the endoplasmic reticulum (ER).
Ribosomes are small, spherical organelles that are found in the cytoplasm of cells. They are responsible for the synthesis of proteins, which they do by reading the genetic information in mRNA (messenger RNA) and using this information to assemble amino acids into polypeptide chains.
Once the polypeptide chains are synthesized by ribosomes, they are then transported to the endoplasmic reticulum (ER), which is a complex network of membranous tubes and sacs that is involved in the synthesis, modification, and transport of proteins and lipids. The rough endoplasmic reticulum (RER) is studded with ribosomes, and it is responsible for the synthesis and packaging of proteins. As the polypeptide chains are synthesized by ribosomes on the RER, they are folded and modified by a number of enzymes and other proteins that are located within the RER. Once the proteins are properly folded and modified, they are packaged into transport vesicles and transported to the Golgi apparatus for further processing and distribution to their final destination within the cell or outside of the cell.
Overall, ribosomes and the endoplasmic reticulum play important roles in the synthesis and packaging of proteins in cells.
Glucose and fructose are monosaccharides that have the same chemical formula, C6H12O6. However, they do not react the same chemically. Which of the following generalizations can explain this? (5 points)
a
Monosaccharides serve different cellular functions, and they are only involved in reactions in which they are needed.
b
The atoms of monosaccharides are arranged differently, and the different shape gives each monosaccharide unique properties.
c
Monosaccharides have different properties, but the disaccharides they form when combined with other molecules will have the same properties.
d
The atoms of monosaccharides are arranged similarly, but the monomers from which they are formed have different physical and chemical properties.
Answers
Answer:
B
Explanation:
Monosaccharides are the simplest carbohydrates. Although glucose and fructose have the same molecular formula they have different structures or the atoms are arranged differently from each other and this is evident in the way they react, behave and in their properties.
B. The atoms of monosaccharides are arranged differently, and the different shape gives each monosaccharide unique properties.
Explanation:
Good luck! Hope this helps :)
Is bone alive?
Please give evidence.
No links please
Answers
u have to be more specific on your question
p. 72
1)Describe the roll of each of the following in the nutrient cycling:
a)Bacteria:
b)Fungi:
c)Plants:
d)Animals
Answers
Bacteria play a crucial role in nutrient cycling as they are responsible for breaking down organic matter into simpler forms.
They are also involved in the process of nitrogen fixation, where atmospheric nitrogen is converted into a form that can be used by plants. Fungi, on the other hand, are decomposers that break down complex organic matter into simpler forms, releasing nutrients back into the soil. They also form symbiotic relationships with plants, helping them absorb nutrients from the soil.
Plants play a vital role in nutrient cycling as they absorb nutrients from the soil and use them to grow. They also release oxygen into the atmosphere through photosynthesis, which is essential for the survival of animals. Finally, animals are an integral part of the nutrient cycle as they consume plants and other animals, breaking down complex organic matter into simpler forms that can be recycled back into the ecosystem. Through their waste products, animals also release nutrients back into the soil, contributing to the growth of plants. In summary, all these organisms play critical roles in the nutrient cycle, each contributing to the overall balance of the ecosystem.
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explain how to create a energy pyramid
Answers
Answer:
triangles and energy mix find the formula then boom
Explanation:
The bottom of the energy pyramid, or the first trophic level, is where producers, also known as autotrophs, are. They go here because they make their own food through photosynthesis and this means they have the most energy on the pyramid.
The next level is for primary consumers, or the herbivores in the ecosystem. They get their energy by eating plants, however they do not gain as much energy as the autotrophs make. We’ll get to the why in a moment.
The third trophic level is home to secondary consumers, who eat the primary consumers (and possibly some producers depending on species) for energy. However they do not gain as much energy as the primary consumers or autotrophs.
Typically there is another, fourth trophic level. Here are the tertiary consumers, who get their energy from eating secondary consumers, primary consumers, and ,(depending on species (again)), producers. They have the least amount of energy.
Why is it that energy decreases as we go up the pyramid?
This is called the Rule Of Ten or Ten Percent Rule, I’ve heard both. This means that only ten percent of the energy is passed on as we go up the energy pyramid, the rest goes to bodily functions and other kinds of energy.
I hope this helps!!
Some form of early Homo is estimated to have evolved into Homo erectus around: O 5-7.5 million years ago
O 1.7-2 million years ago O 10,000-40,000 years ago O 50,000-70,000 years ago t
Answers
Some form of early Homo is estimated to have evolved into Homo erectus around 1.7-2 million years ago, option B is correct.
Homo erectus is believed to have evolved around 1.7-2 million years ago based on fossil evidence and dating methods. Fossil discoveries, such as the famous Nariokotome Boy skeleton found in Kenya, provide crucial insights into the anatomy and characteristics of Homo erectus. These fossils, along with other archaeological and genetic evidence, suggest that Homo erectus was the first hominin species to exhibit significant anatomical and behavioral differences from earlier hominins.
The emergence of Homo erectus marked a significant milestone in human evolution, as this species had a larger brain size, more advanced tool-making abilities, and potentially even the ability to control fire. These developments laid the foundation for the subsequent evolution of Homo sapiens, option B is correct.
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The complete question is:
Some form of early Homo is estimated to have evolved into Homo erectus around:
A) 5-7.5 million years ago
B) 1.7-2 million years ago
C) 10,000-40,000 years ago
D) 50,000-70,000 years ago
What happens to this enzyme when the pH rises above 12?
I'll give you brainliest if you answer correctly
Answers
Enzymes are also sensitive to pH . Changing the pH of its surroundings will also change the shape of the active site of an enzyme.
How do endocrine hormones reach their target cells?
Select the best answer.
View Available Hint(s)
a. Hormones are released at synapses adjacent to target cells.
b. Hormones are transported through the blood stream to target cells.
c. Ducts transport hormones directly to target cells.
d. Hormones travel through the lymphatic system to target cells.
e. Hormones are produced by endocrine cells that are adjacent to target cells.
Answers
The answer is b. Hormones are transported through the bloodstream to target cells. This is because endocrine hormones are released into the bloodstream by endocrine glands, which are then carried throughout the body to reach their target cells.
The endocrine system is responsible for regulating various bodily functions through the secretion of hormones. Hormones are chemical messengers that are released by endocrine glands into the bloodstream, which then transport them to their target cells. Once the hormones reach their target cells, they bind to specific receptors on the cell surface or within the cell, which triggers a response that regulates various bodily functions.
In conclusion, endocrine hormones are transported through the bloodstream to reach their target cells. This process ensures that the hormones are able to reach their target cells throughout the body and regulate bodily functions effectively.
The endocrine system is a complex network of glands that secrete hormones into the bloodstream to regulate various bodily functions such as growth and development, metabolism, and reproductive processes. Endocrine hormones are produced by specialized cells within the endocrine glands, and are released directly into the bloodstream where they can reach their target cells.
The bloodstream acts as a transport system for endocrine hormones, allowing them to be carried throughout the body to reach their target cells. As the blood flows through the body, the hormones are distributed to all parts of the body and eventually reach their target cells. Once the hormones reach their target cells, they bind to specific receptors on the cell surface or within the cell, which triggers a response that regulates various bodily functions.
The transportation of hormones through the bloodstream is a highly efficient process that ensures that the hormones are able to reach their target cells throughout the body. This allows for the precise regulation of bodily functions and ensures that the body functions properly.
In contrast, hormones are not released at synapses adjacent to target cells (a) because hormones are not neurotransmitters, which are released by neurons at synapses to communicate with other neurons or target cells. Ducts do not transport hormones directly to target cells (c) because endocrine hormones are released into the bloodstream and transported throughout the body. Hormones do not travel through the lymphatic system to target cells (d) because the lymphatic system is a separate system that primarily transports lymph and immune cells, and is not involved in the transport of hormones. Finally, while some hormones may be produced by endocrine cells that are adjacent to target cells (e), this is not the primary mechanism by which endocrine hormones reach their target cells.
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Identify the characteristics of life. Check all that apply.
Answers
Answer:
* Having cells
* Use energy
* Reproduce
* Respond to the environment
* grow and develop Cells
Explanation:
Answer:
-Has one cell or more
-Use energy
-Reproduce
-Grow and develop
-Respond to the environment
What does an organism's genotype describe?
the allele combination for a trait
the physical appearance of a trait
the number of alleles on a gene
the number of different traits inherited
Answers
Answer:
the allele combination for a trait
Explanation:
The genotype describes which alleles (versions) of a gene an organism has. Diploid organisms, such as humans, have two copies of each gene. Sometimes these alleles are the same and the individual is h0m0zygous for that gene. If they are different, the individual is heterozygous for that gene.
The physical appearance of a trait is the phenotype.
Answer:
The answer is A.
Explanation:
I don't know for sure but I will come back and tell u if it is right after my quiz...
Practice: Punnett Squares
Part 1: Label the following genotypes as heterozygous or homozygous. You can use abbreviations.
1. aa
home
2. BB home 3. cc_home
4. Dd heter
Part 2: Based on the following genotypes, determine the phenotype.
6. In humans, tongue rolling is dominant to not being able to roll the tongue.
TT=
Tt-
7. In humans, mid-finger hair is dominant to no mid-finger hair.
tt ===
5. Ee hitel
Answers
When two dominant alleles for a feature are present in an organism, the genotype is referred to as dominant homozygous. Using the example for eye color, the letter BB is used to represent this genotype.
Who has heterozygous genotypes?A gene's two distinct alleles in one location. An heterozygous genotype can have two separate alleles that are mutants (compound heterozygote) or one normal allele and one mutant allele.
The homozygous genotype is which?possessing two identical copies of the same gene—one inherited by the mother as well as one from the father—is referred to by this phrase. Either both genes of a homozygous genotype are normal and both genes share the same mutant (change).
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why is it necessary to classify plants?
Answers
Answer:
Plants are classified based on these 3 characteristics: The evergreen plants are plants that retain leaves at all times.
Hope this helps!
Answer:
The main purpose of classifying plants is to ensure that the right plants are correctly named, grouped and identified. Plants are classified based on these 3 characteristics: The evergreen plants are plants that retain leaves at all times (all year round).
Explanation:
I hope that help u
What is a proper hypothesis to guide your experiment?
Answers
Answer:
hope it helps...
Explanation:
When conducting scientific experiments, researchers develop hypotheses to guide experimental design. A hypothesis is a suggested explanation that is both testable and falsifiable. You must be able to test your hypothesis, and it must be possible to prove your hypothesis true or false.
may someone please help me?
Answers
Answer:
15. BB, Bb
16. bb
19. tt
20. TT, Tt
(17 and 18 are given).
Explanation: