The correct answer for this question is letter C. Epiglottis is the one who prevents food from entering the trachea. It moves in a back and forth manner. When a person swallows, it covers the entrance of the larynx by flattening itself backwards.
A, C, and B. These are seen in a square of the periodic table.
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Answer:
No of groups studied
As All other factors will effect the result ofvthe experiment.
But no matter how many groups you take to study they will show the same result
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