The main two factors that control the metabolic rate are _

Diet and physical activity.

Explanation:

There are many factors that alter the metabolic rate, such as age, genetics, sex, weight, height, level of physical activity and diet. Older age makes metabolism slower, and men generally have faster metabolism than women, and exercise increases metabolism. In general, diet and physical activity are the main factors for altered metabolism

answer; /// the correct answer to the above statement is (a) because of the decline on native american labor forces;

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