Which is considered as forerunners of vertebrata? Why? Explain its subphylum
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Answer:
Vertebrates comprise all species of animals within the subphylum Vertebrata (chordates with backbones). Vertebrates represent
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Explanation:
Embryos of all vertebrates develop notochord and gill-clefts.Notochord is partly or fully replaced by vertebral column in the adults of all vertebrates gills-clefts close in the adults of some amphibians and all reptiles,birds and mammals.
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