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zysi [14]
2 years ago
7

Before a star is born, the matter that will become the star exists as a what?

Biology
1 answer:
Svetach [21]2 years ago
5 0

Answer:

A: Cool, Dark Nebula

Explanation:

Before a star is born, the matter that will become the star exists as a interstellar gas and dust.  The stars are formed as a result of the force of gravity compresses atoms in the interstellar gas. Then the fusion reaction begins. During this fusion reaction the temperature gets extremely high and all the material evolves into a hot bright star.

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What are the reasons for the several day delay in a primary response. Infection______. A. transport to secondary lymphoid tissue
Liula [17]

Answer:

The correct answer is D. proliferation and differentiation.

Explanation:

Primary immune response occurs due to the first exposure of an antigen to the immune system. The primary immune response is generally delayed by many days because it takes time for B and T cells to become cloned and to proliferate and differentiate.

Then after several days of proliferation and differentiation of activated T and B cells, T cells become effector T cells and B cell becomes plasma cells which then eliminates the antigen. Memory B and T cells are also produced during this process which helps in generating a quick immune response during the second and subsequent exposure of that antigen.

So the correct answer is D. proliferation and differentiation.

7 0
3 years ago
which of the following describes a relationship of parasitic oxpecker birds eat Parts take ticks off the back of zebras a tick a
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8 0
3 years ago
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LenKa [72]

Answer:

parasitism

Explanation:

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4 0
3 years ago
Explain why the tetraphenylcyclopentadienone is in deep purple color? Explain why the tetraphenylcyclopentadienone is in deep pu
NikAS [45]
<span>Tetraphenylcyclopentadienone has five conjugated aromatic rings. Its structure suggests that it is highly conjugated. With this structure, it absorbs the energy from wavelengths of colors other than violet and reflects the energy from violet wavelengths.</span>
4 0
3 years ago
When a cell was examined under a microscope, it was found that it did not have a cell wall . Which of these is likely to be miss
shtirl [24]

Answer:

When a cell was examined under a microscope, it was found that it did not have a cell wall . It has a cell membrane which shows the viewed cell under microscope is an animal cell

Explanation:

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3 years ago
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