Which of the following cells is part of the body's second line of defense?

Name: Which of the following cells is part of the body's second line of defense?
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Question

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Natural killer cells are a part of the body's second line of defense. They are able to recognize and destroy virus-infected cells and cancer cells without the need for prior exposure or recognition. Mucous cells are a part of the body's first line of defense, while germ cells and B and T lymphocytes are a part of the body's third line of defense.

Which of the Following Cells Is Part of the Body's