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Ureotelic and the uricotelic excretions

Comparing the toxicity and requirement for dilution in water how dissimilar are the ureotelic and the uricotelic excretions? Give some illustrations of animals which present such respective kinds of excretion?

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Urea is much water-soluble than uric acid (a nearly insoluble substance). Urea is as well more toxic. Both though are less toxic than ammonia. Some invertebrates, adult amphibians chondrichthian fishes, and mammals are ureotelic. Reptiles, birds and mainly arthropods are uricotelic.

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