what do you mean by excretion?
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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.
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excretion is the removal of toxic substances and metabolic wastes, meaning that all living organisms engage in some form of excretion. In plants, that takes the form of gaseous excretions and water.in animals, it's generally gases, fluids, and solid wastes
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