Answer: a close evolutionary connection between humans and many other mammals
Explanation:
It starts in the mouth where chemicals in the saliva called amylase, break down starch and other food molecules into smaller sugars and molecules. Those are then carried down to the stomach. So the saliva in the mouth is really what starts the chemical digestion.
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When you cross the parents on the outside of the Punnett square, the letters inside the boxes are the offspring