what is meant by excretion?Explain the process of formation of urin.
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- Excretion is a process in 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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The process of excretion
Excretion is the removal of waste mainly urea with the help of urine by kidneys. Proteins are digested to form amino acids and the final by-product of the degradation of ammonia is urea. ... This causes changes in the composition of the glomerular filtrate resulting finally in the formation of urine.
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