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Desertion of the ammoniotelic excretion

Why subsequent to the passage of animals from aquatic to the terrestrial habitat does the desertion of the ammoniotelic excretion take place?

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Ammonia is a highly toxic molecule when not diluted and rapidly excreted out of the body. For this cause the ammoniotelic excretion was deserted in terrestrial habitats since the availability of water for dilution is decreased in this medium and wastes can’t be excreted therefore promptly to the exterior.

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