Biology
Biology, 13.11.2019 23:31, anyaivy44

Which structures are part of the body's first line of defense against pathogens?

a. mucous membranes

b. lymph nodes

c. white blood cells

d. red blood cells

answer
Answers: 3

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Which structures are part of the body's first line of defense against pathogens?

a. muc...

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