why is urinary bladder absent in snakes crocodile and birds?
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Bladders are absent in crocodilians, snakes, some lizards, and most birds, because the urine of these is semisolid, consisting mostly of uric acid. In mammals the bladder is formed from part of the allantois and from the urodeum (a subdivision of the cloaca
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Because they don't have the same complex organs as humans and.... They don't drink or have a lot of water in them.... They save water mostly... So they don't have all these things
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