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Why do sharks and other ureotelic …

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Why do sharks and other ureotelic animals retain some urea in their kidney matrix.... Pls I need answer immediately pls guys help me
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Yogita Ingle 4 years, 1 month ago

Terrestrial adaptation necessitated the production of lesser toxic nitrogenous wastes like urea nd uric acid for conservation of water. Mammals, many terrestrial amphibians and marine fishes mainly excrete urea and are called ureotelic animals. Ammonia produced by metabolism is converted into urea in the liver of these animals and released into the blood which is filtered an excreted out by the kidneys. Some amount of urea may be retained in the kidney matrix of some of these animals to maintain a desired osmolarity.

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