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

User Gro
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Answer: They have contact with the external environment.

Explanation: it good

User Ramzi Trabelsi
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4 votes

Answer:

They have contact with the external environment.

Step-by-step explanation:

User MarcGuay
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