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Answer : 1 Epiglottis Explanation : Answer: A) Epiglottis Explanation: Epiglottis is that prevents food from entering the windpipe. It is a cartilageous flap that flaps opens and closes when swallowing. When you swallow, the epiglottis flattens backward to cover the entrance to your larynx and prevent food from entering the lungs and windpipe. The epiglottis returns to its usual position after swallowing.

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