Hi! Why do sharks and bony fishes excrete urea but other fishes defecate ammonia?

or:Hi! Why do sharks and bony fishes excrete urea but other fishes defecate ammonia?or:because some sharks have the same excrete system as well as f

or:Hi! Why do sharks and bony fishes excrete urea but other fishes defecate ammonia?


or:because some sharks have the same excrete system as well as fish

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