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

Name: Which is part of the body's second line of defense?
Brand: Quizplus
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Question

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Natural killer cells are part of the body's second line of defense. They are able to recognize and destroy infected or abnormal cells without the need for prior exposure or activation, unlike B and T lymphocytes which are part of the third line of defense. Mucous cells are part of the first line of defense, while germ cells are not involved in the immune response.

Which Is Part of the Body's Second Line of Defense