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B
Alimentary canal
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C
Liver
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D
Kidney
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Solution
The correct option is C Liver Mammals, many terrestrial amphibians and marine fishes mainly excrete urea and are called as ureotelic animals.
Ammonia produced by metabolism is converted into urea in the liver of these animals and released into the blood, which is filtered and excreted out by the kidneys.
Urea is produced from ammonia in five enzymatic steps. The urea cycle begins inside liver mitochondria but three of the subsequent steps takes place in the cytosol; the cycle thus spans two cellular compartments.