Chordates are not a specific group of vertebrates; rather, they are a broader phylum that includes all animals with a notochord at some stage in their development, which encompasses vertebrates (like amphibians, reptiles, and mammals) as well as some other organisms. So, while amphibians, reptiles, and mammals are all groups of vertebrates, chordates is a larger category that includes both vertebrates and invertebrate relatives.
Which is not a group of vertebrates? Chordates, amphibians, reptiles, or mammals?
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