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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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Hence option c. the formation of bone from within fibrous membranes is the right option

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Explanation:

hope this helps <3

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