Answer: They are part of the scientific method. The test results confirm or disprove the hypothesis.
Explanation:

The digestion of protein begins at mouth and it continues at stomach and small intestine.
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Yes, c because you can cross out protein because thats healthy and you cant really increase carbohydrate and c fat is the most unhealthy one so. and also fat is what makes you gain weight say theres to much "fat' in food.t
The fossil record shows that life found on earth before was much different from life found on earth today.