Natural killer cells

(a) make a person look old pretty quickly.

(b) are produced in large numbers when we stay awake.

(c) help us fight viruses and bacteria.

(d) work well even for sleep-deprived people.

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Solution

Natural killer cells: (c) help us fight viruses and bacteria.

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Most parents are not aware of what goes on when their kids go to sleep and how the brain works when we are asleep.

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Q. What is the main idea of the above passage?

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Natural killer cells (a) make a person look old pretty quickly. (b) are produced in large numbers when we stay awake. (c) help us fight viruses and bacteria. (d) work well even for sleep-deprived people.

Natural killer cells: (c) help us fight viruses and bacteria.

Natural killer cells

(a) make a person look old pretty quickly.

(b) are produced in large numbers when we stay awake.

(c) help us fight viruses and bacteria.

(d) work well even for sleep-deprived people.