What is the body's last and most complicated line of defense against infection?
a. digestive...
What is the body's last and most complicated line of defense against infection?
a. digestive system
b. immune system
c. circulatory system
d. endocrine system
user: the diseases ringworm and athlete's foot are caused by
a. bacteria.
b. parasitic worms.
c. fungi.
d. viruses.
Answers: 1
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