Multiple choice

Humans are protected from air pollution by

  1. sneezing and coughing

  2. nasal hairs that filter particles

  3. mucus capturing small capsules

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The human respiratory system uses multiple defense mechanisms, including nasal hairs to trap large particles, mucus to capture smaller particles, and reflexes like sneezing and coughing to expel irritants.

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