autumnmosley1245 autumnmosley1245
  • 24-06-2020
  • Biology
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The first line of defense involves which structure(s)?
O T-cells
O skin
O blood
O B-cells
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laceebarfield25 laceebarfield25
  • 24-06-2020

Answer:

skin.

Explanation:

the first line of defense uses physical parts such as skin.

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