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JulsSmile [24]
3 years ago
14

Which structure represents the body's first line of defense against infection?

Biology
2 answers:
MAXImum [283]3 years ago
7 0
The answer is A : Thymus
castortr0y [4]3 years ago
7 0
The first line of defense for the body is the skin. It forms the layer that keeps external things out.
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4 years ago
genetics and the environment both play roles in cell differentiation. which is the best example of an environmental factor influ
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