asked 97.1k views
4 votes
8. Which of the following body systems does the immune system rely on to provide the first line of defense against pathogens?

A. integumentary system
B. nervous system
C. circulatory system
D. endocrine system

1 Answer

2 votes
I think it is A. integumentary system.
answered
User Roman Pfneudl
by
8.4k points
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