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vredina [299]
3 years ago
8

The first line of defense involves which structure(s)? T-cells skin blood B-cells

Biology
2 answers:
Lerok [7]3 years ago
7 0

Answer:

option 2, skin

Explanation:

8_murik_8 [283]3 years ago
6 0

Answer:

b skin

Explanation:

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