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Ostrovityanka [42]
3 years ago
10

Your _______ system must be on constant guard against invading bacteria, viruses, parasites, or other foreign substances to your

body.
a. respiratory
b. excretory
c. integumentary
d. immune
Health
1 answer:
Lubov Fominskaja [6]3 years ago
4 0
D, immune, if i'm not wrong.
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