Succession of the kidney
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Explanation:
Although all kidneys are fundamentally nephridial tubes that extract liquid waste from the blood, the kidneys of different animals are by no means homologous structures.
Among vertebrates there are three kinds of nephridial structures serving as kidneys that differ from each other not only in structure and position in relation to the blood system and the excretory tubes, but also in their embryonic history.
The three kinds of kidneys, as named by the English embryologist, Balfour, are the pronephros of a few cyclostomes; the mesonephros of fishes and amphibians; and the metanephros of reptiles, birds, and mammals.
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