Some foreign substances in the body are too small to start an immune response by themselves, so they join to proteins in the blood, where they are able to trigger an immune response. These substances are called ________.

Fill in the blank(s) with the appropriate word(s).

haptens

Haptens are foreign substances in the body that are too small to start an immune response by themselves.

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Which vitamin is an antioxidant and can protect the cells from the damaging effects of the free radicals?

A) A B) B C) D D) E

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