Researchers are investigating processes that happen during digestion. Which answer choice describes only a physical change during digestion?
Hydrochloric acid in the stomach breaks down proteins.
Chewing in the mouth breaks food into small pieces.
Enzymes in saliva start the digestion of starches before food is swallowed.
Bacteria in the intestines convert dietary fiber into fats.
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Researchers are investigating processes that happen during digestion. Which answer choice describes...
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