Ammonia is the chief excretory substance in

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(D) Ammonia is highly toxic and requires a large amount of water for its elimination. Therefore,it is the primary excretory product in aquatic animals

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Fresh water fishes

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(D) Ammonia is highly toxic and requires a large amount of water for its elimination. Therefore,it is the primary excretory product in aquatic animals that have easy access to water. Fresh water fishes are ammonotelic,meaning they excrete ammonia as their chief nitrogenous waste. In contrast,mammals like camels,whales,and porpoises are ureotelic,excreting urea to conserve water.

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