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vertebrates
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Which phylum is most closely related developmentally to the first vertebrate?
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echinodermata
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carolineoammons
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Terms in this set (27)
Which phylum is most closely related developmentally to the first vertebrate?
echinodermata
Four of the following are features found exclusively among all vertebrates. Which one is the exception?
four legs
In the accompanying figure, which structure is a rod of stiffened support tissue?
it first evolved in arthropods; notocord
Which group of mammals exhibits the widest distribution and greatest diversity?
placentals
The most diverse group of placental mammals are the ______.
rodents