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What does Metabolism do?

  1. Purifies the body by eliminating waste matter

  2. Serves as a protective covering and helps regulate the body's temperature

  3. Process of changing food into forms the body can use as energy

  4. Controls the steady circulation of blood through the body

The correct answer is: Purifies the body by eliminating waste matter

Metabolism is the process of changing food into forms the body can use as energy. This involves breaking down food molecules to release energy and building new molecules needed by the body. Option A, "Purifies the body by eliminating waste matter," does not accurately describe metabolism. Metabolism primarily involves energy production and nutrient processing rather than waste elimination. Options B and D relate to other functions in the body not directly related to metabolism.