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The source of excreted materials in organisms primarily comes from metabolic processes within cells, where waste products are generated during the breakdown of nutrients for energy. These materials can include carbon dioxide, urea, and various salts, which are transported through the bloodstream to excretory organs like the kidneys, lungs, and skin for removal from the body. Additionally, undigested food and other non-absorbable substances are expelled through the digestive system, contributing to excretion.

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1w ago

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