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The human digestive system is a complex series of organs responsible for breaking down food, absorbing nutrients, and eliminating waste. It begins with the mouth, where mechanical digestion occurs through chewing, and chemical digestion starts with enzymes in saliva, such as amylase, which breaks down starch into simpler sugars. The tongue helps in __________ _________ _______ __________ _________ ________ _________ ______ ________ ___ ___ __________.
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