Answer:
umm
Explanation:
Select the correct statement about the three-chambered hearts of amphibians and nonbird reptiles. A scheme of blood circulation of reptiles except for birds. The reptiles have a three-chambered heart that consists of two atria and one ventricle with an incomplete septum. There are two circuits: pulmonary and systemic. In the pulmonary circuit, the blood from the right ventricle is pumped in to lung capillaries and returned to the left atria. In the systemic circuit, the blood is pumped from the left ventricle to the systemic capillaries via the left systemic aorta and is then returned to the right atria. There is also one vessel going from the right ventricle to the aorta right before it branches to smaller arteries. This vessel carries mixed blood. All blood on the right side of the circuits is venous and all blood on the left side is arterial. Select the correct statement about the three-chambered hearts of amphibians and nonbird reptiles. The three-chambered hearts of amphibians and nonbird reptiles are facultative, allowing variation in blood flow through the heart. The three-chambered heart is inferior to the four-chambered hearts of birds and mammals, limiting the evolutionary success of amphibians and nonbird reptiles. Pulmonary and systemic blood fully mixes in the ventricle of a three-chambered heart.
Answer:
The three-chambered hearts of amphibians and nonbird reptiles are facultative, allowing variation in blood flow through the heart.
Explanation:
In Anatomy, cardiac cycle can be defined as a complete heartbeat of the human heart which comprises of sequential alternating contraction and relaxation of the atria and ventricles, therefore causing blood to flow unidirectionally (one direction) throughout the human body.
Generally, the cardiac cycle occurs in two (2) stages;
I. Diastole : in this stage, the ventricles is relaxed and would be filled with blood.
II. Systole: at this stage, the muscles contracts and thus, allow blood to be pushed through the atria.
All amphibians and reptiles except for crocodiles (having four-chambered heart) have three-chambered hearts, which typically comprises of a partially divided ventricle and two atria.
Hence, the correct statement about the three-chambered hearts of amphibians and nonbird reptiles is that, the three-chambered hearts of amphibians and nonbird reptiles are facultative, allowing variation in blood flow through the heart due to the partially divided ventricle.
what is photosynthesis
Answer:
Explanation:
photosynthesis is the process in which algae plants and bacteria use energy from the sun and turn it into food for themselves
Why are flowers so important to a plant?
Answer: Flowers help purify water and also helps hold the soil in place and prevent erosion.
CREDIT: fed.us
Answer:
The primary purpose of a flower is reproduction. Since the flowers are the reproductive organs of plant, they mediate the joining of the sperm, contained within pollen, to the ovules — contained in the ovary. Pollination is the movement of pollen from the anthers to the stigma.
Explanation:
Which of the following are possible results of mutated genes?
(Choose all that apply)
minimal effect
no effect
beneficial effect
harmful effect
Answer:
harmful effect and no effect
Explanation:
No effect: most mutated genes destroy themselves before it gets to far
Harmful effect: an example of harmful effects would be down-syndrome (where you have 3 21-chromosomes and you are only supposed to have 2)
Answer:
no effect, beneficial effect, harmful effect
Explanation:
Which of the following are possible results of mutated genes? (Choose all that apply)
no effect
beneficial effect
minimal effect
harmful effect
Beneficial mutations increase the diversity of the gene pool, which adds to the survival of the species as opposed to those that have harmful or no effect.
Took the test and these are the correct answers.
Meiosis and Mutations are both sources of/for:
O Genetic Drift
O Polyploidy
O Mutations
Genetic Diversity
Answer:
genetic drift
please mark as brainlest
The diagram below shows a diploid cell with two homologous pairs of chromosomes. Due to independent assortment and crossing-over, the possible allelic combinations that could be found in gametes by the meiotic division of this cell are _________________.
A
Bb, Dd, BB and DD
B
BD, bD, Bd and bd
C
BBDd and BDbd
D
Bd and bD only
Due to independent assortment and crossing-over, the possible allelic combinations found in gametes by the meiotic division of this cell are B and D can be on one chromosome, while b and d can be on the other. Therefore, the correct answer is (B) BD, bD, Bd, and bd.
What is crossing-over?Crossing-over is a process that occurs during meiosis, the cell division process that produces gametes (sperm and egg cells) in sexually reproducing organisms. During crossing-over, homologous chromosomes exchange genetic material, resulting in the creation of new combinations of alleles.
What is the law of independent assortment?The law of independent assortment is a fundamental principle in genetics that describes how different genes are inherited independently. Gregor Mendel first proposed this principle.
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What is the effect of slow climate change?
Answer: Climate change also increases the appearance of more violent weather phenomena, drought, fires, the death of animal and plant species, flooding from rivers and lakes, the creation of climate refugees and destruction of the food chain and economic resources, especially in developing countries.
Explanation: Hope this helps
Organs whose activity is simulated by FSH are indicated by
Answer:
Gonads, thyroid gland, adrenal gland
tadpoles must undergo a major metamorphosis to become frogs. this change includes reabsorption of the tail, growth of limbs, calcification of the skeleton, increase in rhodopsin in the eye, development of lungs, change in hemoglobin structure, and reformation of the gut from the long gut of an herbivore to the short gut of a carnivore. amazingly, all of these changes are induced by triiodothyronine. what is the most likely explanation for such a wide array of effects of thyroxine?some tissues have membrane receptors for triiodothyronine, while other tissues have triiodothyronine receptors within the nucleus.different releasing hormones release triiodothyronine to different tissues.there are many different forms of triiodothyronine, each specific to a different tissue.different tissues have triiodothyronine receptors that activate different signal transduction pathways.
The hormone triiodothyronine (T3) plays a crucial role in the metamorphosis of tadpoles into frogs, triggering various transformative processes such as tail reabsorption, limb growth, skeletal calcification, and organ development.
Triiodothyronine (T3) is a hormone that regulates the body's metabolism. Tadpoles undergo a major metamorphosis to become frogs, which involves several changes, such as reabsorption of the tail, growth of limbs, calcification of the skeleton, increase in rhodopsin in the eye, development of lungs, change in hemoglobin structure, and reformation of the gut from the long gut of an herbivore to the short gut of a carnivore.
Interestingly, all of these changes are induced by triiodothyronine.
Different tissues have triiodothyronine receptors that activate different signal transduction pathways is the most likely explanation for such a wide array of effects of thyroxine.T3 receptor, a member of the nuclear hormone receptor superfamily, is present in the cell nucleus of many tissues, including those in the nervous system, liver, kidney, and the cardiovascular system.
The receptor is a transcription factor that binds to DNA in the cell nucleus, where it activates or represses gene expression. The T3 receptor regulates the transcription of target genes that are critical for controlling development, growth, differentiation, and metabolism in various tissues.
T3 controls a wide range of physiological processes by regulating gene expression, and the effects of T3 are tissue-specific.
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Courtney and Kenzie are doing an experiment to determine which fish food gives their fish more energy. They have two fish tanks, each with the same number, size, and type of fish. The tanks are the same size and have identical filters and decorations. They were both filled with store-bought spring water and are cleaned at the same time. When the girls submitted their results to a journal for publication, scientists criticized the experiment.
What about the experiment would need to be changed so that scientists might accept their findings?
A) The fish would need to be fed more food.
B) The tanks would need more fish in each one.
C) There would need to be several more tanks of fish.
D) The tanks would need to have a different type of water
When Courtney and Kenzie submitted their results to a journal for publication, scientists criticized the experiment. The experiment would need to be changed so that scientists might accept their findings by having several more tanks of fish.
Why would they need to change their experiment? Scientists criticized the experiment because it is not possible to determine which fish food gives their fish more energy just from two tanks of fish. Having more tanks of fish would mean that the study is more precise and closer to what could happen in the real world. This will result in more precise findings to support or reject the hypothesis that the fish food gives their fish more energy. Therefore, it can be concluded that C) There would need to be several more tanks of fish is the correct option.
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hat are the two possibilities for Fred’s genotype?BRAIN 10 POINTS
Answer:
11%2F6_ -Amoeba Sisters Video Recap and Practice Problems.docx
Explanation:
#maxmeasabrainliestChromosomes contain all the genetic ________, all the instructions you need to make a person.
PLEASE HELP ITS BILL NYE VIDEO FILL IN THE BLNK
Answer:
Could the blank possibly be genetic code? Not really sure, but I think that it makes sense.
What affects the rate of alcoholic fermentation
Answer:
The rate of fermentation is influenced by several factors like temperature, type of sugar solution, concentration of yeast and concentration of glucose.
Explanation:
How do species evolve?
Answer:
Natural selection.
Explanation:
Animals mate with different animals creating a species with different genes that helps their kin live longer or stronger.
A green rat snake that lives in the grass and a brown rat snake that lives in the desert is a form of _______________
a
genetic engineering
b
natural selection
c
selective breeding
d
simple variation
Answer:
Natural selection
Explanation:
Hope this helps :)
Which statement would be most appropriate when thanking the Band Parents Group for a large college scholarship?
A. You guys are awesome!
B. I am totally psyched about this scholarship.
C. Your generosity shall not be unacknowledged.
D. Thank you very much for this honor,
Answer: Thank you very much for this honor,
Explanation: You should act formally when talking to people who are respected. This is the most obvious choice hence the situation.
fitb. quizlet the air pressure normally ____ before a cold front passes and ____ after a cold front passes.
fitb. Quizlet: The air pressure normally decreases before a cold front passes and increases after a cold front passes.
Before a cold front passes, there is typically a decrease in air pressure. This is because a cold front is associated with the movement of a mass of colder air replacing a mass of warmer air. As the colder air advances, it displaces the warmer air, leading to a decrease in air pressure.
After a cold front passes, there is generally an increase in air pressure. This is because the cold front brings in denser and cooler air, which sinks and creates higher pressure at the surface. The cooler air is often more stable, leading to clearer skies and higher pressure conditions.
It's important to note that these patterns are generalizations and can vary depending on specific weather systems and local conditions. Other factors, such as wind patterns and atmospheric disturbances, can also influence air pressure changes associated with cold fronts.
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How can fossils be used to determine the relative ages of rock layers?
Answer:
they use radiometric dating methods (find out what day it was formed)
Explanation:
based on the natural radioactive decay of certain elements such as potassium and carbon, as reliable clocks to date ancient events.
how it reacts to certain chemicals can determine how old it is
What is the period of a wave if the wavelength is 100 m and the speed is 200 m/s?
O 0.5 s
o 25
100 s
200.000 s
Answer: 0.5 s
Explanation: speed = wavelength · frequency and period T = 1/ frequency.
Frequency = speed / wavelength = 200 m/s : 100 m = 2 s^-1 and T = 0.5 s
Which of the following pollutants is used in agriculture and landscaping and might cause nerve damage, birth defects and cancer in humans?
A. particulate matter
B. lead
C. pesticides
D. bacteria
Other:
Answer: pesticides
Explanation:
.how does contraction of a single muscle cell, which would cause tension on the surrounding endomysium, ultimately cause tension on the tendon of the muscle?
When a single muscle cell contracts, the causes tension on the surrounding endomysium, ultimately causing tension on the tendon of the muscle to be transferred to the surrounding endomysium.
What is a contraction?Contraction is the act of pulling or tightening a muscle through the movement of the muscle fibres. This movement generates tension, which is transmitted through the endomysium to the tendon of the muscle.
A single muscle cell is the fundamental unit of muscle contraction. The contraction of these cells results in a number of biochemical and biophysical changes within the cells, culminating in muscle tension. The tension is transferred to the surrounding endomysium, which is a thin layer of connective tissue surrounding each muscle fiber. When tension is applied to the endomysium, it transfers the force to the perimysium, which is a thicker connective tissue layer that surrounds bundles of muscle fibers.
Finally, the tension reaches the epimysium, which is a dense layer of connective tissue that surrounds the entire muscle. The epimysium is continuous with the tendon, which is a tough band of connective tissue that connects the muscle to the bone. Therefore, the contraction of a single muscle cell causes tension in the tendon of the muscle.
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Match the following terms and definitions. 1. an electrical nerve impulse sent by nerve fibers to the central nervous system for interpretation chemoreceptors 2. neurons that detect chemicals such as those found in food effector 3. type of eyes many arthropods have; eyes that protrude outward and consist of many lenses electroreceptors 4. the structure that gives the response to an environmental change compound eyes 5. neurons that detect electrical fields action potential 6. secretion of hormones into the blood stream to affect distant processes endocrine
Answer:
1. an electrical nerve impulse sent by nerve fibers to the central nervous system for interpretation. Action potential.
2. neurons that detect chemicals such as those found in food. Chemoreceptors.
3. type of eyes many arthropods have; eyes that protrude outward and consist of many lenses. Compound eyes.
4. the structure that gives the response to an environmental change. Effector
5. neurons that detect electrical fields. Electroreceptors.
6. secretion of hormones into the blood stream to affect distant processes. Endocrine.
Explanation:
An action potential is a change in the internal charge of a cell due to depolarization. These changes allow the transmission of a message from any part of the body to the central nervous system. The central nervous system will interpret the message and will give a response.
There are different types of receptors in our bodies. Chemoreceptors are the ones that detect chemicals and produce an action potential or a neurotransmitter. These receptors respond to chemicals. Another type of receptor is the electroreceptors. They detect electrical fields and are only on the skin of aquatic animals.
Compound eyes have a large number of ommatidia. As a result, the anthropods with this type of eyes have a large view angle. In other words, every ommatidium sees an image, and the final product is a combination of all of them.
The effector is the structure that gives an answer once an affector has sent the message to the nervous system that there was a change in the environment.
There are different kinds of secretions, autocrine, paracrine, and endocrine. In the endocrine secretion, the gland secrets hormones into the bloodstream so that they can travel long distances up to their target cell, which is far from the gland.
1. an electrical nerve impulse sent by nerve fibers to the central nervous system for interpretation. Action potential
2. neurons that detect chemicals such as those found in food. Chemoreceptors
3. type of eyes many arthropods have; eyes that protrude outward and consist of many lenses. Compound eyes
4. the structure that gives the response to an environmental change. Effector
5. neurons that detect electrical fields. Electroreceptors
6. secretion of hormones into the blood stream to affect distant processes. Endocrine
Which of these types of muscles are striated? Check all of the boxes that apply.
1) skeletal muscles
2) cardiac muscles
3) smooth muscles
Answer:
Muscle Types: Cardiac and skeletal muscle are both striated in appearance, while smooth muscle is not. Both cardiac and smooth muscle are involuntary while skeletal muscle is voluntary.
Answer: skeletal muscles & cardiac muscles
Explanation: Skeletal and cardiac muscles are striated. Smooth muscles are not.
which group of genes in drosophila embryos must be mutated if the result is elimination of a significantly sized, contiguous region of segmentation?
The group of genes in Drosophila embryos must be mutated if the result is the elimination of a significantly sized, contiguous region of segmentation is gap genes.
What are gap genes?
Gap genes are a group of genes that are expressed throughout the central region of the Drosophila embryo. Gap genes, along with other segmentation genes, are responsible for establishing the boundaries between segments in the developing Drosophila embryo. Gap genes are classified into three broad categories: anterior, middle, and posterior, based on their expression patterns.
Gap genes in Drosophila are required for correct patterning of the anterior-posterior axis of the embryo. Gap genes are necessary for defining the broad regions of segmentation, which are then subdivided into smaller regions by pair-rule genes. The proper patterning of the Drosophila embryo requires the activity of gap genes.
In contrast to maternal genes, which establish the anterior-posterior axis of the embryo, gap genes define large, contiguous regions of the developing embryo and are necessary for setting up the basic body plan.
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choose all that are effects of the sympathetic division on the circulatory system. multiple select question. increased heart rate vasoconstriction of blood vessels in the skin vasodilation of visceral blood vessels increased blood clotting decreased heart rate vasoconstriction of visceral blood vessels need help? review these concept resources.
The effects of the sympathetic division on the circulatory system are:
- Increased heart rate
- Vasoconstriction of blood vessels in the skin
- Vasodilation of visceral blood vessels
Explanation to the above given short answers are written below,
- Increased heart rate: The sympathetic division of the autonomic nervous system stimulates the release of norepinephrine, which binds to beta-adrenergic receptors in the heart, leading to an increased heart rate.
This response prepares the body for physical activity or stress by supplying more oxygen and nutrients to the muscles.
- Vasoconstriction of blood vessels in the skin: Sympathetic stimulation causes the constriction of blood vessels in the skin.
This response helps redirect blood flow to vital organs and muscles, which is important during fight-or-flight responses when increased blood supply to these areas is needed.
- Vasodilation of visceral blood vessels: The sympathetic division can also cause vasodilation in blood vessels supplying visceral organs, such as the liver and kidneys. This response allows for increased blood flow to these organs, supporting their metabolic functions.
The other options listed (increased blood clotting, decreased heart rate, vasoconstriction of visceral blood vessels) are not typically associated with the effects of the sympathetic division on the circulatory system.
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The excretory system eliminates wastes. Identify the waste materials described. Filtered material from the blood that includes toxins like urea, salts, and even excess water. Composed of excess water, salt, and a urea that are released from glands. A mixture of undigested material, bacteria, and other materials that cannot be used by the body.
1. Urine
2. Sweat
3. Feces
Explanation: bc I said so
Urine is the filtered material from the blood that includes toxins like urea, salts, and even excess water. Sweat is composed of excess of water, salt, and a urea that are released from glands. Feces are the mixture of undigested material, bacteria, and other materials that cannot be used by the body.
What are the excretory products?Excretion is the physiological process which involves the elimination of metabolic waste products out of the body. The excretory products include amino acids, urea, uric acid, carbon dioxide, water, ammonia and other compounds.
Urine is the filtered material from the blood that include toxins such as urea, salts, and even excess water. Sweat or perspiration is composed of excess water, salt, and urea that are released from the glands. Feces are the mixture of undigested material, bacteria, and other materials that cannot be used up by the body.
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What is an example of nonsense mutation in biology?
An example of a nonsense mutation is in cystic fibrosis, where the amino acid phenylalanine is replaced with a stop codon in the CFTR gene, resulting in a nonfunctional protein that leads to a buildup of mucus in the lungs and other organs. Another example is hemophilia A, which is caused by a nonsense mutation in the F8 gene that results in the production of a truncated, nonfunctional protein product.
A nonsense mutation refers to a type of mutation that results in a premature stop codon, thereby terminating the translation of the protein before it is complete. It can be a point mutation, in which a nucleotide substitution changes a codon that normally encodes an amino acid to one of the three stop codons: UAA, UAG, or UGA.
The stop codons signal the end of the protein sequence, and the protein is terminated prematurely as a result. As a consequence, the protein is usually nonfunctional or partially functional. This mutation can result in a shortened protein product with little or no activity, depending on the location of the mutation in the gene.
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4 A population of tree-climbing lizard lives on one bank of a large river.
The other bank of the
river is a treeless prairie. During a flood, 40
lizards were transferred to the prairie side
of the river. After 200
generations, this transferred population of lizard lost the ability to
climb.
Which mechanism is MOST likely responsible for this loss of function
within the transferred
population?
natural selection
genetic drift
gene flow
mutation
Answer:
Genetic Drift, it is a textbook example of genetic drift.
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The total volume of water that flows past a certain point in a given time, often expressed in thousands of cubic meters per second, is described as a stream's The total volume of water that flows past a certain point in a given time, often expressed in thousands of cubic meters per second, is described as a stream's flow
The total volume of water that flows past a certain point in a given time, often expressed in thousands of cubic meters per second, is described as a stream's flow. Accurate measurements of stream flow are crucial for many applications, such as flood forecasting, irrigation planning, and hydroelectric power generation. The flow rate of a stream is usually measured in cubic meters per second (cms), and it represents the volume of water that flows past a certain point per second.
The stream's flow may vary significantly depending on the season, precipitation, and other factors. Some streams may be entirely dry in summer, while others may carry several thousand cubic meters of water per second.The total volume of water that flows past a certain point in a given time can be expressed as a rate in units of volume per time, such as cubic meters per second or thousands of cubic meters per second. For example, a stream's flow rate of 5000 cubic meters per second means that 5000 cubic meters of water flow past a given point on the stream every second. In stream flow rate is the total volume of water that flows past a certain point in a given time, often expressed in thousands of cubic meters per second. It can be calculated as the product of the stream's cross-sectional area and its average velocity. The flow rate of a stream can vary significantly depending on precipitation, season, and other factors, and it is an important consideration for the management of water resources. Accurate measurements of stream flow are crucial for many applications, such as flood forecasting, irrigation planning, and hydroelectric power generation.
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If a mutation has no effect on fitness, it may stay in the gene pool indefinitely.
TRUE/FALSE
The given statement "If a mutation has no effect on fitness, it may stay in the gene pool indefinitely" is true because If a mutation has no effect on fitness, meaning it neither enhances nor reduces an organism's ability to survive and reproduce.
It is considered neutral in terms of natural selection. In this case, the mutation can persist in the gene pool indefinitely. Since natural selection acts on traits that affect an organism's fitness, mutations that have no impact on fitness are not subject to selective pressures. As a result, these neutral mutations can accumulate and persist in a population without being eliminated by natural selection.
Over time, the frequency of these neutral mutations may fluctuate due to genetic drift, migration, or other factors, but they can remain in the gene pool over generations. It's important to note that even though a neutral mutation may persist, it may still be lost or go to fixation in a population due to random chance or other evolutionary forces.
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