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Ksju [112]
3 years ago
10

The first line of defense involves which structures?

Biology
2 answers:
Alchen [17]3 years ago
8 0

Answer: it’s Skin

Explanation:

Ne4ueva [31]3 years ago
3 0

Answer:

The first line of defense involves skin.

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Gaseous exchange is fundamental in aerobic organisms because oxygen is required to carry out cellular respiration.

<h3>What is cellular respiration?</h3>

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