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As the teeth tear and chop the food, spit moistens it for easy swallowing. A digestive enzyme in saliva called amylase (pronounced: AH-meh-lace) starts to break down some of the carbohydrates (starches and sugars) in the food even before it leaves the mouth.

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I'm sorry but I really can't answer that
Good luck though
A. the sixth mass extinction is believed to be caused by human-related factors.
Diffusion occurs. because of the status of movement