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erastovalidia [21]
3 years ago
6

What component of Earth’s atmosphere exists entirely as a result of photosynthesis?

Biology
2 answers:
beks73 [17]3 years ago
5 0

Answer:

A

Explanation:

marysya [2.9K]3 years ago
3 0
Hello, the correct answer is A because plants use carbon dioxide and transform it into oxygen gas. 
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What is on a transplanted organ that causes the transplant recipient's body to reject it?
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Answer:

Major histocompatibility complex (MHC) antigens

Explanation:

The process in which recipient body rejects the transplanted organ is called a allograft rejection or transplantation rejection.

A transplanted organ contains Major histocompatibility complex (MHC) antigens which are required to be accepted by the recipient's body to function properly but T cells in recipient's body become alloreactive and recognize MHC antigens (donor-derived antigens) as foreign and starts making antibodies against it. Which means the recipient's body is rejecting the  transplanted organ.

Hence, the correct answer is "Major histocompatibility complex (MHC) antigens".

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Explanation:

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Answer with Explanation:

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