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dsp73
3 years ago
13

The first line of defense involves which structure(s)?

Biology
1 answer:
Elza [17]3 years ago
7 0
Skin is the first defense structure.
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Are you referring to this question?

All BUT one descriptive phrase applies to the illustration of water. That is

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If you are, then the answer would be letter b. the empirical formula of water is HO.<span>  </span>

<span>>Water Molecular Formula</span><span>: H</span><span>2</span><span>O</span>

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