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Urine is a liquid by-product of metabolism that is excreted by the kidneys. It helps remove waste and excess substances from the body, maintaining homeostasis.
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Kidneys: Organs that filter blood to produce urine, removing waste products and excess substances.
Homeostasis: The body's process of maintaining a stable internal environment despite external changes.
Metabolism: The set of life-sustaining chemical reactions in organisms that includes catabolic reactions breaking down molecules to produce energy.