The excretory system performs the function of eliminating waste substances produced by cellular metabolism from the fluids circulating in the body. Freshwater fish, tadpoles and crocodiles excrete ammonia. Marine fish, adult amphibians, mammals, turtles, and some lizards excrete urea. Birds, snakes, and some lizards excrete uric acid. Man and Dalmatian dog excrete both urea and uric acid.
The excretory system performs the function of eliminating waste substances produced by cellular metabolism from the fluids circulating in the body. Freshwater fish, tadpoles and crocodiles excrete ammonia. Marine fish, adult amphibians, mammals, turtles, and some lizards excrete urea. Birds, snakes, and some lizards excrete uric acid. Man and Dalmatian dog excrete both urea and uric acid.
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