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If amphibian kidneys are unable to concentrate urine, why do they produce it at all?

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If amphibian kidneys are unable to concentrate urine, why do they produce it at all?

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Urine is solution of waste products that generally need to be excreted from the body. Fish and amphibians do not need to concentrate urine, because they can simply drink and absorb plenty of water to replace what is lost. Uric acid still needs to be removed from the body, even if it can’t be concentrated in solution. The ability to concentrate urine was developed first by reptiles, to help in conserving water in the body. This allowed reptiles to move away from moist areas and water sources for long periods of time. The part of the mystery you may be missing is that Amphibians also produce urates, which are created by the liver, and excreted by the kidneys. Urates are a solid, chalky white or yellowish substance. (Reptiles and birds also produce urates). Not concentrating their urine may allow amphibians to retain important salts in their bodies more readily, and the need to use plenty of water in the process is no great concern. Remember, the kidneys remove waste from the blood, they

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