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Read the article above and answer the following questions


1. The cardiovascular system includes:

A. the heart

B. blood

C. blood vessels

D. all of the above


2. Which of the following is NOT carried through the body by blood?

A. valves

B. carbon dioxide

C. nutrients

D. oxygen


3. Which of the following carries blood out of the heart?

A. arteries

B. veins

C. blood vessels

D. tubes


4. Which of the following is NOT a part of blood?

A. red blood cells

B. white blood cells

C. gorta

D. plasma


5. What is the heart largely composed of?

A. plasma

B. platelets

C. muscle

D. both B and C

Answer:

23 chromosomes

Unlike all the other cells in a human body which are diploid, human sex cells are haploid. That means that both sperm cells and ova are haploid; containing only 23 chromosomes.

Explanation:

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The chromosomes in egg and sperm cells have just 23 chromosomes each.

Male gametes are termed sperm, while female gametes are called "ova." Gametes are an organism's reproductive cells, also referred to as "gender cells." Since gametes are haploid cells, each chromosome is present in one copy per cell.

Unfertilized reproductive cells are called gametes. A zygote is an egg that has been fertilized. Gametes are always haploid cells since they are a byproduct of meiosis.

Zygote is a diploid structure because it results from the fusing of a male and female haploid gamete.

Similar to a sperm, an egg has 23 chromosomes total, which is half the number found in a normal cell.

The resultant embryo will therefore have the typical 46 chromosomes in total after an egg and sperm join during fertilization.

Thus, there are 23 chromosomes in human ovum.

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its letter b the genetic drift because it is mechanism of evolution in which allele frequencies of a population change over generation due to chance.

Cystic fibrosis is a recessive genetic disease that encodes the CFTR protein, but some populations have a relatively high rate of cystic fibrosis carriers, which protects against severe dehydration and is an example of the heterozygote advantage that is present in Option D.

When the gene is present in a heterozygote state, the gene product benefits the individual rather than harming him or her, as in sickle cell anemia and cystic fibrosis. In sickle cell anemia, the heterozygote state protects the person from malaria, and in cystic fibrosis, it protects the person from dehydration.

Hence, Cystic fibrosis is a recessive genetic disease that encodes the CFTR protein, but some populations have a relatively high rate of cystic fibrosis carriers, which protects against severe dehydration and is an example of the heterozygote advantage that is present in Option D..

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Answer:

I think kingdom protista, plantae, or animalia

Answer: Plantae, animalia, protista

Explanation: I got right on test.

Answer:

The tilt creates what we know as seasons and changing weather. Without the pull of the moon, this tilt would change.

Explanation:

Either the tilt would become extreme, leading to extreme and severe seasons, or the tilt would decrease, and we would see almost no seasons at all. The moon influences life as we know it on Earth.

Answer: Because It is the pull of the Moon's gravity on the Earth that holds our planet in place. Without the Moon stabilising our tilt, it is possible that the Earth's tilt could vary wildly. It would move from no tilt (which means no seasons) to a large tilt (which means extreme weather and even ice ages).

Explanation:

Answer:

Ocean waves are usually formed by a distant wind. ... The area which the wind affects the surface is called the fetch. The larger the fetch, the greater the waves produced. the small waves generated by storm winds are often confused and disorganized.

Explanation:

Answer:

For a wave to effectively be produced there need to be large wind, long period of time and a large distance of water. If they are all reduced, then there would be a reduction in the intensity of the wave.

Explanation:

Answer:

13,636 seconds = 227.3 minutes = 3.79 hours

Explanation:

The titin protein has a molecular weight of 3,000,000 daltons, while the average molecular mass of one amino acid is 110 daltons, so it is expected that this protein is composed of 27,273 amino acids (3,000,000 daltons/110 daltons = 27,272.72). Moreover, and since the translation rate is two amino acids per sec, it is expected that the protein will be synthesized in approximately 3.79 hours (27,272.72/2 = 13,636 seconds = 227.3 minutes = 3.79 hours).

Answer:

Explanation:

Transcription is the process by which the information in a strand of DNA is copied into a new molecule of messenger RNA (mRNA). ... The newly formed mRNA copies of the gene then serve as blueprints for protein synthesis during the process of translation.

Answer:

18 litres

Explanation:

Using Boyle's law equation as follows:

P1V1 = P2V2

Where;

P1 = initial pressure (atm)

P2 = final pressure (atm)

V1 = initial volume (litres)

V2 = final volume (litres)

According to the information in this question, An inflated basketball hold 6 liters (V1) of air at 3 atm (P1). The volume of air (V2) at 1 atm (P2) that went into the ball can be calculated thus:

Using P1V1 = P2V2

3 × 6 = 1 × V2

18 = V2

V2 = 18 litres.

Answer: 5. Biologically numerous groups also are much more likely to include species that confer resilience to that ecosystem due to the fact as a network accumulates species, there may be a better risk of anybody of them having developments that permit them to conform to a converting environment.

3. The polar bear's ecological niche is that of a specialized predator of seals. When there are numerous seals around, adult polar bears will usually devour the blubber (fat) and pores and skin of the seals, which gives an awesome supply of energy. Younger bears will devour beef because the protein allows them to grow.

Explanatation:

Got them from g o o g l e but kind of change it up a bit

1. How do tundra ecosystems in biodiversity compare in biodiversity to other types of ecosystems?

Answer: Ecosystems in the arctic tundra are an example of those where there are fewer species overall than in other kinds of ecosystems.

2. What is a niche?

Answer: a role that a species plays in the ecosystem

3. Describe a polar bear's niche.

Answer: Some animals gain from polar bears' hunting of seals. A polar bear will leave behind significant portions of a seal after eating all of it. In tundra environments, these leftovers are a source of food for Arctic foxes, gulls, and other birds, particularly during the chilly winter months when there is nothing to eat. Healthy polar bear populations can have a good effect on other species' numbers, such as those of birds or Arctic foxes. Numerous other species are harmed when polar bear populations drop.

4. Who else benefits from polar bear hunting?

Answer: Arctic foxes, gulls, and other birds

5. How does low biodiversity impact the stability of a tundra ecosystem?

Answer: The species that provide resilience to an ecosystem are therefore far more likely to be found in biologically diverse groups because as a network accumulates species, there may be a greater chance that any one of them will have evolved to adapt to a changing environment.

Answer:

C : Proteins

Explanation:

(Can I get brainlest?)

Proteins are the molecules that provide building blocks for tissues, transports other molecules, and helps regulate certain reactions in the human body. The correct option is C.

A protein is a found naturally, extremely complex substance composed of amino acid residues linked together by peptide bonds.

Proteins are found in all living life forms and contain a variety of important biological compounds such as enzymes, hormones, and antibodies.

Proteins are massive complex molecules that perform numerous important functions in the body.

They are essential for the structure, function, and regulation of the body's tissues and organs and do the majority of the work in cells.

Proteins are molecules that serve as foundation for tissues, transport other molecules, and aid in the regulation of certain bodily reactions.

Thus, the correct option is C.

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Answer:

Due to its size and feeding requirement.

Explanation:

In the forest ecosystem, many lions feeds on one deer or buffalo because the food is in large amount and this food is enough to fulfill the requirements of that lions so we can say that many predators eats one prey while  on the other hand, there are some predators that feeds on many prey at one because they are small in size and one prey did not fulfill their requirement so that's why the predator feeds on many preys. Fox feeds on many mice is the example of one predators feed on many prey.

Answer:

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Answer:

artificial selection by selectively breeding the larger variants

Explanation:

Explanation:

Something that is lacking, is a circulatory system. Instead of a typical circulatory system flatworms exchange oxygen with the air outside through diffusion. This is the process by which gases will pass through a membrane from an area of high concentration to an area of low concentration.

Answer:

a) temperature

Explanation:

took test and got right

light intensity does not affect the rate of photosynthesis .

The process in which plants, algae and certain bacteria use light energy of sunlight, water, carbon dioxide and convert light them into chemical energy and starch. called as photosynthesis.

Photosynthesis occur in special organelles named chloroplast which has its own DNA, genes and hence can synthesize their own proteins.

Chloroplasts have stroma, fluid, and stack of thylakoids known as grana, three types of chlorophyll such as chlorophyll a, chlorophyll b, and carotenoids.

Oxygenic photosynthesis is  commonly observed in plants, algae and cyanobacteria where electrons are transferred from water to carbon dioxide by using light energy, to produce energy,  oxygen is produced along with carbohydrates.

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Answer:

Explanation:

Anatomía comparada

Answer:

B) The mouse is in a state of tolerance.

Answer:

The interphase consists of the G1 phase, S phase, and G2 phases.​ :3

Explanation:

:3

Answer:

Explanation:

free convection

This transfer of heat energy away from the ground by the vertical movement of air is called "free convection" or "natural convection." A hot air balloon rises because warmer air is less dense than cool air.

Answer:

Two individuals mate, and each is capable of producing over 8 million potential gametes. The random chance of any sperm and egg coming together is a product of these two probabilities.

Answer:

The flowers which contain both male and female reproductive organs are known as full or bi flowers. They will self-pollinate themselves. Examples: Tulip, Sunflowers and Lily

Explanation: did it awhile ago hope this helps you pass!

Answer:

Like they said, bisexual flowers hold both female and male reproductive parts of a flower meaning they can pollinate other flowers and themselves.

Explanation:

Answer:

Birds + planes = chicken

Explanation:

If you divide the air density by the amount of dirt on the sun, you get three roasted turkeys and a new haircut.

Answer:

Hey you forgot the part were you stuff the candle with cotton and then square the amount of laptops you have then divide by the amount of iphones produced by the worms that eat batteries to get the answer chicken AND 3 marked white vans but the catch is there are not white they are actually red

Explanation:

Evaporation of water molecules from the cells of a leaf creates a suction which pulls from the xylem cells of the roots.Thus,the transpiration helps in the absorption and upward movement of water and minerals dissolved in it from roots to leaves in the help of ascent of sap .

may this was ur answer

Answer:

b

Explanation:

Answer:

b) Forming zygots

Explanation:  

A zygote can be defined as a eukaryotic cell formed by the fusion of gametes during sexual reproduction. In general, a zygote is a diploid (2n) cell produced by the fusion of two haploid (n) gametic cells (eg., in mammals, sperm and egg cells). In multicellular organisms, the zygote is the first stage of development, which will give rise to an adult organism as it divides and grows. A zygote cell can be considered as a pluripotent stem cell because it differentiates into all cell types.