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nika2105 [10]
2 years ago
7

SOMEONE PLEASE HELP QUICK

Biology
1 answer:
siniylev [52]2 years ago
6 0

Answer:

1

Explanation:

1-1=1

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Answer:

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Umiditatea de 100%

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3 years ago
True or false. The absence of a trait cannot be used as a synapomorphy in phylogenetic analysis
kolbaska11 [484]

Answer:

False

Explanation:

Phylogenetic analysis is a means of establishing evolutionary relationships.

Synapomorphy is a shared ("syn") character that is different from the form found in an ancestor that distinguishes a clade (monophyletic group)from other organisms

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2 years ago
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
2 years ago
Rusting is a chemical reaction between iron and oxygen. Over time, the mass of a rusting nail
marshall27 [118]

Answer: Yes this chemical reaction obeys the laws of physics. Its very simple, let me explain.

Explanation:

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4 0
3 years ago
The human heart is separated into left and right sides. this type of structure provides for the
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3 0
3 years ago
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