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

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

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User Gro
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2 Answers

3 votes

Answer: They have contact with the external environment.

Explanation: it good

answered
User Ramzi Trabelsi
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4 votes

Answer:

They have contact with the external environment.

Step-by-step explanation:

answered
User MarcGuay
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