Biology for IGCSE & O level - Diseases And Immunity (Section 2 - No. 47)
Which of the following is a key step in preventing the spread of disease via the air?
Shaking hands with everyone.
Covering your mouth and nose when coughing or sneezing.
Eating contaminated food.
Not washing hands.
Explanation
Covering your mouth and nose prevents pathogens from being released into the air.
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