Based on the context provided for each blank, here are the answers:
A: While in the stomach, food is broken down by powerful acids and turned into chyme.
B: The pharynx forms the food substance into balls and then pushes it into the esophagus.
C: After the food has been chewed and lubricated, it is pushed by the tongue into the pharynx.
D: The kidneys remove excess water, salts, uric acids, and chemicals from the blood.
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