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KS3 Biology Nutrition, digestion and excretion learning resources for adults, children, parents and teachers.
All organisms need to perform the life processes to prevent extinction, or dying out. Humans and most complex animals perform these life functions in order to maintain homeostasis. One of the life processes is excretion. Excretion is the removal of waste products by an organism. Some waste products are sweat, urine, and carbon dioxide. Without.
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Removal of harmful waste from the body is called excretion. Many wastes are produced during various metabolic activities. These need to be removed in time because their accumulation in the body can be harmful and even lethal for an organism. The human excretory system is composed of a pair of kidneys.
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Plants also produce waste nitrogen, but only in small amounts. They do not possess organs to remove it, so store it in some of their cells after they have turned it into a harmless substance.
Excretion Excretion is the process of removing harmful metabolic wastes such as urea, uric acid and salts from the body. Excretion in organisms. Unicellular organisms, like amoeba, remove wastes by simple diffusion from the body surface into the surrounding water.
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Type of waste and mode of excretion: Protein is made up of nitrogen. Metabolism of protein creates nitrogenous wastes in the body. The nitrogenous waste is the main waste in animals. The nitrogenous waste takes different forms in different animals. These are; ammonia, urea and uric acid. Based on the type of nitrogenous waste, animals can be.
