Frogs are unique among the vertebrates because they possess, at some stage of development,

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Frogs are unique among vertebrates due to their short vertebral column and modified pelvic region, adaptations related to their jumping and swimming abilities. Other options like a notochord, dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail are common features in the development of many vertebrates, not unique to frogs.

Frogs Are Unique Among the Vertebrates Because They Possess, at Some