Which statement describes many of the structures involved in the first line of defense of the immune system?

asked Jan 2, 2021 62.1k views

5 votes

by Gro

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3 votes

Answer: They have contact with the external environment.

Explanation: it good

Ramzi Trabelsi answered Jan 2, 2021

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4 votes

Answer:

They have contact with the external environment.

Step-by-step explanation:

MarcGuay answered Jan 5, 2021

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