Multiple choice

Nitrogen in air

  1. is essential for the body

  2. dilutes oxygen which, otherwise, is very active in the pure form

  3. makes oxygen soluble in blood

  4. decreases the density of air
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Nitrogen makes up about 78 percent of the atmosphere. Its presence dilutes oxygen, which is highly reactive, preventing fires from spreading too quickly and protecting biological tissues from oxygen toxicity.

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