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Cellular and Molecular Biology

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Innate Immunity: Levels of Immune Defense

CELLS-FSSXGJ

The human body has three lines of defense by the immune system: the first, second and third lines of defense.

Which of the following do/does NOT comprise the first line of defense in the human body?

A

Skin.

B

Tears.

C

Saliva.

D

Fever.