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Kidneys are necessary for organisms to live on land in order to filter ammonia out of their bodies. While water is abundant for sea creatures to immediately filter and expel waste products from their bodies, water is used at minimum levels on land. Kidneys filter ammonia out as urea and store the waste in the bladder until it is expelled from the body using a minimal amount of water.

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Q: Why is the kidney an evolutionary advancement for land animals?
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