When you compare the genome of one individual to another, you will find that

The previous answer is incorrect all human DNA is 99% identical

Explanation:

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so, when you eat, your teeth chew and grind food into smaller pieces. this is mechanical digestion. then reactions aided by digestive enzymes break down large food molecules into smaller molecules. this is chemical digestion. the two processes change the food into simpler substances that can be used by the body for raw materials and energy.

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tobey