Answer:
People get the flu every year because unfortunately the flu virus mutates every year.
Explanation:
Crocodile Steve was killed doing what he loved best - hanging out in the water, observing the wildlife around him. One wildlife adaptation cost Steve his life. Stingrays, catfish, and scorpion fish all have an adaptation that helps protect them against predators. This adaptation is
a. venom
b. mimicry
c. camouflage
d. electric organs
Answer:Venom
Explanation:
Scorpions have venom in their pinchers. Catfish have venom in their dorsal and pectoral fin which contains a venom that causes edema (swelling). Stingray’s each spine contains venom, and the stingray's tail.
Venom, many fish may defend themselves by injecting venom. The majority of venomous fish use their spines to deliver the poisons, hence option A is correct.
What is adaptation?
Many different fish have venomous spines, such as stingrays, chimeras, scorpionfishes, catfishes, toadfishes, rabbit fishes, and stargazers.
Crocodile Steve was slain while doing what he liked most: relaxing in the lake and taking in the local animals. Steve's life was lost due to a wildlife adaption. All three species of stingrays, catfish, and scorpion fish share an adaption that helps shield them from predators.
A near relative of scorpionfishes known as the stonefish is the most poisonous fish in the world. The stonefish may inject a poison that can kill an adult in less than an hour through the spines on its dorsal fin.
Therefore, venomous fish use their spines to deliver the poisons, hence option A is correct.
Learn more about adaptation, here:
https://brainly.com/question/29344767
#SPJ5
The biologic mechanism which functions to maintain the internal condition of cells constant is called a control system.
postive
internal
homeostatic
Answer:
homeostasis
Explanation:
I have all day, last class! answer ASAP!!!
If an experiment gives about the same result every time it is performed, then its results are
A. reproducible.
B. accurate.
C. precise.
D. all of these
Answer:
Right answer : A. reproducible.
Explanation:
Answer:
reproducible
Explanation:
just did it on study island got it right (also love the fairy tail pfp)
HELP PLZ HELP GOD BLESS YOU AND YOUR GRADES
Answer:
Solids- Particles do not move around freely
Liquids- Particles move around one another.
Both- Particles stay near other particles.
Explanation:
Solids- Solids are all in a fixed shape, hence the particles don't really move.
Liquids- Liquids don't have a fixed shape, but the particles still don't stray too far apart.
Both- Both types of states require for the particles to be somewhat close to each other.
Hope i helped! :3
Answer:
solids: Particles do not move around freely
liquids: Particles move around each other
both: Particles stay near other particles
Explanation:
Will say I got confused at first
when does energy transfer from a cold object to a hot object?
Answer:
Conduction occurs when two object at different temperatures are in contact with each other. Heat flows from the warmer to the cooler object until they are both at the same temperature. Conduction is the movement of heat through a substance by the collision of molecules.
Hope this helps
Answer:
Conduction occurs when two object at different temperatures are in contact with each other. Heat flows from the warmer to the cooler object until they are both at the same temperature. Conduction is the movement of heat through a substance by the collision of molecules.
Read more on Brainly.com - https://brainly.com/question/16257402#readmore
Explanation:
PLEASE HELP I'll MARK THE BRAINLIEST
1.) A vessel that carries oxygen-rich blood to the heart muscle is called a(n): *
A.) Coronary Artery
B.) Vein
C.) Ventricle
D.) Atrium
2.) A group of cells that receives messages about the body's oxygen needs and sends out signals to adjust the heart rate is called the: *
A.) Atrium
B.) Lymph Node
C.) Valve
D.) Pacemaker
3.) Blood components that helps the body control bleeding are: *
A.) Hemoglobin
B.) Red Blood Cells
C.) White Blood Cells
D.) Platelets
4.) Plasma is mostly composed of: *
A.) Blood Cells
B.) Water
C.) Proteins
D.) Hemoglobin
5.) Which of the following is NOT a characteristic of a vein? *
A.) Valves prevent backward flow of blood
B.) Returns blood to the heart
C.) Walls are one cell thick
D.) Walls are generally thinner than those of arteries
6.) The largest artery in the body is called the: *
A.) Aorta
B.) Atrium
C.) Pacemaker
D.) Coronary Artery
7.) The network of vessels that returns fluid to the bloodstream is called the: *
A.) Lymphatic System
B.) Veins
C.) Arteries
D.) Circulatory System
8.) Hemoglobin is a protein that binds easily to: *
A.) White Blood Cells
B.) Oxygen
C.) Fibrin
D.) Platelets
9.) Which of the following structures pumps blood into arteries leading to the lungs? *
A.) Right Atrium
B.) Left Atrium
C.) Right Ventricle
D.) Left Ventricle
10.) Which of the following structures is NOT part of the cardiovascular system? *
A.) Heart
B.) Blood Vessels
C.) Brain
D.) Blood
11.) True/False: The force of the heart's contracting atria causes blood pressure. *
A.) True
B.) False
12.) True/False: Capillary walls must be very thick to withstand the high force of blood pumped by the heart. *
A.) True
B.) False
13.) True/False: White blood cells defend the body against disease. *
A.) True
B.) False
14.) True/False: Blood travels in two directions in the body. *
A.) True
B.) False
15.) True/False: Blood types are determined by proteins known as marker molecules that are on red blood cells. *
A.) True
B.) False
16.) Fill in the Blank: The right and left __________________ are the two lower chambers of the heart. *
17.) Fill in the Blank: A sphygmomanometer is an instrument that measures ____________________________. *
18.) Fill in the Blank: A flap of tissue that prevents blood from flowing backward is a(n) ______________. *
19.) List two of the three main roles of the cardiovascular system: *
20.) Tell me anything else that you learned in science about the cardiovascular system:
Answer:
coronary arteries
Oxygen is supplied to the heart muscle by the coronary arteries. These are the blood vessels that wrap around the surface of the heart: The left main coronary artery branches into the: Circumflex coronary artery, which supplies blood to the back left side of the heart
Answer:
Answers:
1.)- Coronary Artery
2.)- Pacemaker
3.)- Red Blood Cells
4.)- Water
5.)- Walls are one cell thick
6.)- Aorta
7.)- Lymphatic System
8.)- Oxygen
9.)- Right atrium
10.)- Brain
11.)- False
12.)- True
13.)- True
14.)- False
15.)- True
16.)- Ventricles
17.)- Blood pressure
18.)- valve
19.) The cardiovascular system consists of the heart, blood vessels, and blood. This system has three main functions: Transport of nutrients, oxygen, and hormones to cells throughout the body and removal of metabolic wastes (carbon dioxide, nitrogenous wastes).
20.) Random Facts:
The average heart is the size of a fist in an adult.
Your heart will beat about 115,000 times each day.
Your heart pumps about 2,000 gallons of blood every day.
Explanation:
:3 took a long time but ya
Identify the parts of a cladogram using the drop-down menus. Label A
Answer:
Clade
Explanation:
Answer:
Identify the parts of a cladogram using the drop-down menus.
Label A
Label B
A cladogram is shown. The bottom large bracket is labeled b. The bracket reaches up to another bracket on the right. The bracket reaches up to a double-bracket on the left. The double-bracket is labeled A.
Explanation:
select the correct answer from each drop-down menu.
Lisa eats a banana with her breakfast. As she digests the banana, her blood glucose level increases, which causes the pancreas to
produce
A few hours later, her blood glucose level decreases, signaling the pancreas to
produce
Answer:
Correct answer in blank 1. Insulin.Correct answer in blank 2. Glucagon.Explanation:Insulin is hormone released by pancreas which lowers the sugar level in blood by changing sugar to other forms.Glucagon is a hormone released by pancreas which increase the sugar level in blood.As Lisa eats banana blood sugar increase signaling increase of insulin.After few hours blood sugar decrease due to insulin, signals glucagon production to increase glucose level.
Answer:
1. Insulin , 2. Glucagon
Explanation:
I got it right on Plato.
Invasive species can be a big problem economically and environmentally. This simple food chain illustrates some of the feeding relationships in a (hypothetical) coastal area of Florida that has been heavily impacted by invasive green algae. One of your colleagues has the idea that introducing a new top predator (a big fish from China that will eat little fish) into the area could help to control the invasive green algae. His idea is that the new big fish will eat the small fish, resulting in fewer small crustaceans being eaten, so that there will be more of the crustaceans to eat the invasive algae. Explain the potential problems of your colleagues' plan, including at least two supporting details.
Answer:
The problems that could occor is that the big fish could start to over populate and eat too many of the small fish because there are no preditors to controll its population. Resulting in an over population of small crustations. Meaning a high decress in aglae.
One potential problem that could arise from the colleagues plan is that the big fish will overpopulate leading to the extinction of the small fish that can control the crustaceans.
What is overpopulation of a species?Overpopulation of a species in biological terms is the uncontrolled growth of members of a population.
According to this question, the coastal area of Florida that has been heavily affected by invasive green algae. However, big fishes are introduced into the food chain to control the impact of the invasive species.
The idea of the colleague is that the new big fish will eat the small fish, resulting in fewer small crustaceans being eaten, so that there will be more of the crustaceans to eat the invasive algae.
However, one potential problem that could arise from the colleagues plan is that the big fish will overpopulate leading to the extinction of the small fish that can control the crustaceans.
Learn more about overpopulation at: https://brainly.com/question/14169313
What do the empty shapes in a pedigree chart mean?
a)Unaffected/Carrier
b0Affected
Uhh normally they mean that the person is unaffected or a carrier, but you'd have to look at a specific one since some have different keys.
How does pollen typically travel to a female cone?
birds
water
wind
insects
Answer:
wind
Explanation:
I say wind as well
Explanation:
What is a property of soil that determines how water will soak through the
ground?
A. Capillary action
B. Permeability
C. Gravity
D. Aquifer
Which sentences describe the differences between photosynthesis and cellular respiration?
Check all that apply.
Cellular respiration uses oxygen as a reactant and photosynthesis does not.
Cellular respiration produces glucose and photosynthesis does not.
Cellular respiration produces excess ATP and photosynthesis does not.
Cellular respiration stores energy from the Sun in glucose molecules and photosynthesis does not
Cellular respiration is performed by consumers and photosynthesis is not.
O Cellular respiration releases energy from glucose molecules and photosynthesis does not.
Answer:
A, C, E, F. Are the answers :p
Explanation:
Trust me, Thank me later :)
Final answer:
Photosynthesis and cellular respiration serve opposite functions in the energy cycle. Photosynthesis creates glucose and oxygen from sunlight, which are then used by cellular respiration to release energy, producing ATP and emitting carbon dioxide and water.
Explanation:
The differences between photosynthesis and cellular respiration include their distinct roles in the energy cycle. Photosynthesis uses sunlight to create glucose and oxygen, which are then used in cellular respiration. Cellular respiration releases energy by breaking down glucose in the presence of oxygen, which results in producing ATP and emitting carbon dioxide and water as byproducts. One of the key differences is that photosynthesis stores energy from the sun within glucose molecules, while cellular respiration releases the stored energy from glucose to produce ATP, powering cellular activities.
Therefore, the following sentences describe the differences between photosynthesis and cellular respiration:
Cellular respiration uses oxygen as a reactant while photosynthesis produces it.
Cellular respiration releases energy from glucose molecules which is used to create ATP, a process not performed by photosynthesis.
Cellular respiration is primarily performed by consumers, organisms that cannot produce their own food, unlike photosynthetic organisms that can produce glucose.
The incorrect statements include that cellular respiration produces glucose (which is actually produced by photosynthesis), and that cellular respiration stores energy from the sun in glucose molecules (which is a function of photosynthesis).
During an experiment readings for blood pressure in a person's body were found to be constant. However, when measured by a
different blood pressure cuff, the readings differed by 15 points for each reading. This difference indicates that the results are
but not
This question illustrates how blood pressure readings can vary based on measurement methods and the position of the body. Factors like the type of cuff used and the subject's posture during measurement can lead to differences in readings, which are significant for diagnosing conditions like hypertension.
Explanation:The question refers to an important concept in health and medicine, specifically concerning the measurement of blood pressure. Blood pressure is typically recorded as systolic/diastolic, and readings can be affected by factors such as the type of blood pressure cuff used, the person's state of mind, body positioning, etc. The question seems to be confused by the fact that different cuffs gave different readings, which might indicate that the results are inconsistent, but not necessarily incorrect. It should be noted that blood pressure can vary depending on a variety of factors, including the positioning of the cuff. For example, raising an arm above the shoulder or placing the cuff on the upper leg with the person standing can affect the pressure reading due to the weight of the fluid (blood) in relation to gravity. Also, mercury manometers are preferred over water manometers for measuring blood pressure due to their ability to measure larger pressures and because the density of mercury makes readings more manageable.
These protocells became the first unicellular life forms. Unicellular life
forms then gave rise to _____ life forms as cells began to specialize in function. These are the hypothesized sequence of events in early history
of life on earth. These steps are speculative but still scientific because
they are rooted in logic, firm science, and testable hypotheses.
a. multicellular
b. cell membrane
c. polymers
d. biomolecules
Answer:
Multicellular
Explanation:
This is the only answer that fits.
The green areas on the diagram show the worlds rainforest. What can you conclude about the location of rainforest?
Answer:theres no diagram plllzzz show one so i can answer.
Explanation:
Answer:
i found the diagram.
Explanation:
10. How many protons are in an element with an atomic number of 6 and a mass number of 12?
A 18
B 12
C 10
D 6
Answer:
d-6
The element carbon (C) has an atomic number of 6, which means that all neutral carbon atoms contain 6 protons and 6 electrons. In a typical sample of carbon-containing material, 98.89% of the carbon atoms also contain 6 neutrons, so each has a mass number of 12
Explanation:
Protons and neutrons are always equal The element here is a Carbon molecule. The answer here is D 6
Please mark brainliest and rate 5 stars
Can someone please help with this assignment?
I will make you the brainly user of the week.
I need this done by tonight and I’m struggling. Please help me someone.
what is the assignment
In fungi, which is a disadvantage of asexual reproduction as compared to sexual reproduction?
Asexual reproduction requires ideal environmental conditions.
Asexual reproduction results in offspring that are genetically unique.
Asexual reproduction requires the production of spores.
Asexual reproduction results in fewer offspring.
Answer:
A
Explanation:
got the answer right on the test
In fungi, the following is a disadvantage of asexual reproduction as compared to sexual reproduction: Asexual reproduction requires ideal environmental conditions, which is the first option.
What is the significance of the fungus' asexual reproduction?Asexual reproduction generally produces lots of offspring, but it needs ideal conditions, unlike sexual reproduction, which does not need ideal conditions and produces the offspring. Asexual reproduction allows fungi to rapidly grow and populate new habitats and consume new resources, it also enables fungi to reproduce quickly in response to environmental stress, such as drought or high or low temperatures, and some are used in the production of fermented food and beverages.
Hence, in fungi, the following is a disadvantage of asexual reproduction as compared to sexual reproduction: Asexual reproduction requires ideal environmental conditions, which is the first option.
Learn more about the fungus' asexual reproduction here.
https://brainly.com/question/14917779
#SPJ6
which taxonomic group do the organisms in the diagram fall underA fungi since they lack a cell wall and nucleus be protists since they are unicellular with nucleus C protists with since they are multicellular heterotrophs d fungi since they are multicellular autotrophs
The organisms in the diagram belong to the taxonomic group of Fungi. They are eukaryotic organisms that appeared on land over 450 million years ago and feed on decaying and dead matter.
Explanation:The organisms that fall in the given diagram likely belong to the taxonomic group of Fungi. Fungi are eukaryotic organisms that appeared on land over 450 million years ago. They differ from plants and animals in several ways. For example, they are heterotrophs and contain neither photosynthetic pigments such as chlorophylls nor organelles such as chloroplasts. Fungi feed on decaying and dead matter, making them saprobes. Fungi can be unicellular like yeasts or can develop a network of filaments called a mycelium. The cell of a fungus is surrounded by a thick cell wall made of chitin. Furthermore, fungi are unable to perform photosynthesis, thus they are considered heterotrophic organisms.
Learn more about Fungi here:https://brainly.com/question/1287565
#SPJ12
Which are examples of maintaining homeostasis?select all that apply
The example of maintaining homeostasis is burns on the surface of the skin and infections on the surface of the skin. The correct options are C and E.
What is homeostasis?The sort of self-regulating process, such as homeostasis, helps an organism retain stability while responding to environmental factors that are favorable for its survival.
If homeostasis is effective, life goes on; if it is unsuccessful, the organism dies or suffers a catastrophe.
As it is currently understood, homeostasis is a self-regulating process that allows biological systems to remain stable while responding to shifting environmental factors.
Burns resemble a wound. translates to a skin opening where homeostasis kicks in to stop bleeding. Some skin infections result in bleeding, which triggers homeostasis.
Thus, the correct option is C and E.
For more details regarding homeostasis, visit:
https://brainly.com/question/3888340
#SPJ6
Your question seems incomplete, the missing options are:
Probiotic bacterial growth on the surface of the skin
sweat production on a hot summer day
burns on the surface of the skin
dilation of the skin’s blood vessels
infections on the surface of the skin
constriction of the skin’s blood vessels
Mike works in the metals industry. Which type of coal should he use as a fuel source?
A.lignite
B. bituminous
C. anthracite
D. subbituminous
Answer:
B. bituminous
Explanation:
Bituminous coal is an organic sedimentary rock produced by compression of peat bog material by diagenesis and submetamorphics.
Bituminous coal has low moisture and high carbon content and hence used for the production of steel and cement, coke production an electricity generation.
Coking coal is a type of Bituminous coal are best used as fuel dource in metal industry having very narrow range of volatility and plasticity. Volatility is maintained by smelters to optimize the ease of burn rate, ignition, and energy output of the coal as this determines the burn rate of the coal.
Hence, the correct option is B. bituminous.
Answer:
answer is b
Explanation:
The functional role of an organism in an ecosystem
A)Habitat
B)Niche
C)Primary succession
D)Secondary succession
Answer:
B, Niche
Explanation:
A niche is the role of an organism. A habitat is an organism's home, and C and D don't have to do with the role of an organism. Hope this helped :)
How does the structure of the cell membrane help to enable its function
Answer:
The cell membrane gives the cell its structure and regulates the materials that enter and leave the cell. ... Instead, these molecules must pass through proteins that are embedded in the membrane. In this way, the cell can control the rate of diffusion of these substances.
Explanation: Hope this helped!!!!
Answer: The primary function of the plasma membrane is to protect the cell from its surroundings. Composed of a phospholipid bilayer with embedded proteins, the plasma membrane is selectively permeable to ions and organic molecules and regulates the movement of substances in and out of cells.
Explanation:
Which groups are involved in the peptide links of amino acids?
In peptide bond formation, the amino group of one amino acid reacts with the carboxyl group of another, creating an amide bond. The polypeptide chain has a directional structure with a free amino group at the N terminal and a free carboxyl group at the C terminal, crucial for protein function.
Explanation:Amino acids are the building blocks of peptides and proteins, linked together by peptide bonds. The groups involved in forming a peptide bond are the amino group (-NH2) from one amino acid and the carboxyl group (-COOH) from another amino acid. During the formation of a peptide bond, these groups combine in a dehydration synthesis reaction, resulting in the release of a molecule of water and the creation of an amide bond between the two amino acids.
The resulting polypeptide chain has a free amino group at the N terminal and a free carboxyl group at the C terminal. This directional structure is important as the sequence of amino acids, which determines the protein's properties, is read from the N terminal to the C terminal. The unique sequence of amino acids is key to the protein's structure and function after it goes through post-translational modifications to become fully functional.
Which practice is illegal under the Endangered Species Act?
O
A. Creating species survival plans
O
B. Reintroducing endangered species
C. Collecting endangered species
O
O
D. Captive breeding
Answer:
its C. Collecting endangered species
Explanation:
Collecting endangered species is illegal under the Endangered Species Act. So, the correct option is C.
What are Endangered species?A species that is threatened with extinction in the not-too-distant future, either globally or within a certain political jurisdiction, is known as an endangered species.
Invasive species, habitat degradation, poaching, and other issues may put endangered animals in danger. Species that are in danger of going extinct are considered to be endangered species. Alternatively put, species that are on the verge of extinction.
An organism that faces extinction is referred to as an endangered species. The two main factors that cause a species to become endangered are habitat loss and genetic diversity loss. Natural occurrences may result in habitat loss.The Endangered Species Act forbids the collection of endangered species.
Therefore, the correct option is C.
Learn more about Endangered species, here:
https://brainly.com/question/10415903
#SPJ5
Water is a chemical compound that is made of hydrogen and oxygen atoms bonded together. Water makes up from 50 to 90 percent of a living organism. The remaining mass of the organism consists of a variety of carbon-containing compounds. A valid conclusion that can be drawn from these statements is that living things are composed of
inorganic matter only
neither organic nor inorganic matter
organic matter only
both organic and inorganic matter
Answer:
Organic matter only
Explanation:
Answer:
both organic and inorganic matter
Explanation:
Organic compounds essential to human functioning include carbohydrates, lipids, proteins, and nucleotide.
Inorganic compounds essential to human functioning include water, salts, acids, and bases. These compounds are inorganic; that is, they do not contain both hydrogen and carbon.
A cousin who has been traveling overseas sneaks a plant through customs (who help along with the USDA, help to prevent invasive species) wants to plant this plant in their backyard. What would you say to them to discourage them from doing so? Please facts and scientific reasoning to convince them not to and to destroy the plant.
Answer and Explanation:
Invasive species are not native to an ecosystem/environment to which they've been introduced, which can cause disastrous disruptions to various food chains/webs and other native species' populations.
In this case, your cousin is bringing in a plant from overseas, so it clearly will be an invasive plant. You can tell them the following:
- this plant may take over the feeding source of native plants, causing those populations to decrease drastically or possibly even be wiped out
- secondary consumers that had once relied on those native plants for food energy will now have limited resources, competition will increase, and these consumers may begin to die off
- tertiary consumers that consumed these secondary consumers will begin to die off, as well
- this chain reaction will ripple through the entire food chain and food web, and totally disrupt the existing ecosystem
Thus, your cousin shouldn't plant this organism in their backyard and should instead destroy it.
ANSWER ASAP ILL GIVE U 200 POINTS IF U ANSWER IT RIGHT ON A BLANK QUESTION
Part C: Observing Rhizobium with a Microscope
(Score for Question 3: Click or tap here to enter text. of 5 points)
3. Sketch the bean nodule, labeling cells with and without Rhizobium, showing what you observed with the microscope.
Answer:
Type your answer here. Click or tap here to enter text.
Conclusions
(Score for Question 4: Click or tap here to enter text. of 2 points)
4. Two new species of plants were introduced into an area that was low in available nitrogen compounds in the soil. One formed nodules and one did not. Which species would you reasonably expect to grow more robustly? Explain.
Answer:
Type your answer here. Click or tap here to enter text.
(Score for Question 5: Click or tap here to enter text. of 2 points)
5. How does the location of the nodules relate to the function of the nodule? Explain.
Answer:
Type your answer here. Click or tap here to enter text.
(Score for Question 6: Click or tap here to enter text. of 2 points)
6. This diagram shows two groups of plant cells, one with Rhizobium and one without the bacteria. Label which is which, and explain the obvious size difference, using observations from Part C of the lab in your answer.
Answer:
4. the plant specie with nodule grows robustly as compared to without nodule.
5. the location of nodule in plants are the roots where they perform their function.
6. The size of plant cell with bacteria is high as compared no bacteria.
Explanation:
The plant specie with nodule grows robustly as compared to without nodule because in nodules a special type of bacteria is present which fixes atmospheric nitrogen for the plant and plant in return give food to the bacteria in the form of sugar. Nodules located in roots of the plants because plant absorb nutrients through the soil so the nodules provide nitrates to the roots in the soil. The size of plant cell with bacteria is high as compared no bacteria because bacteria needs space for growth so that's why plants plants cell with bacteria is large in size.
This is a living thing that grows in earth, in water, or on other plants and possess features such as :
RootStemLeaves etcThe most appropriate choice to the questions can therefore be seen above.
Read more about Plants here https://brainly.com/question/17020460
How do the functions of the skeletal and muscular system differ? A. Muscles provide structure and support to the body, while bones move the muscles. B. Bones provide structure and support to the body, while muscles move the bones. C. Bones send signals to the body, and muscles are responsible for movement. D. Muscles send signals to the body, and bones are responsible for movement.
Answer:
B. Bones provide structure and support to the body, while muscles move the bones.
Explanation:
Let's try to eliminate choices.
A: "Muscles provide structure and support to the body, while bones move the muscles."
Muscles actually aren't the ones that provide support for our body; it's the bones and our skeletons that do that. So, this is wrong.
B: "Bones provide structure and support to the body, while muscles move the bones."
Bones do, in fact, provide structure to our bodies, and muscles are the ones that attach to the bones through tendons and help move them. So, B is correct.
C: "Bones send signals to the body, and muscles are responsible for movement."
While it's true that muscles are responsible for movement, bones do not send signals to the body; that's the nervous system's job. C is wrong.
D: "Muscles send signals to the body, and bones are responsible for movement."
Again, muscles don't send signals; neurons do. D is wrong.
The answer is B.