Health
Health, 21.08.2019 15:00, ottie123

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.

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