Essential amino acids are amino acids that must be supplied to one's body by their diet because they cannot be synthesized from scratch.
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Answer:
Excretion is a process by which metabolic waste is eliminated from an organism. In vertebrates this is primarily carried out by the lungs, kidneys and skin. This is in contrast with secretion, where the substance may have specific tasks after leaving the cell. Excretion is an essential process in all forms of life.
Explanation:
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Answer:
Positive feedback loops occur most frequently in the human body.
