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4 July, 15:30

Which of the following body systems does the immune systems rely on to provide the first line of defense against pathogens?

A. Integumentary system

B. Nervous system

C. Circulatory system

D. Endocrine system

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Answers (2)
  1. 4 July, 15:53
    0
    Its B nervous system
  2. 4 July, 18:35
    0
    I think it's D. but i'm not really sure.
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