Vertebrates evolved from primitive forms of which creature?
- Correct Answer: chordates
- eukaryotes
- gastropods
- cephalopods
Explanation: Vertebrates evolved from primitive chordates. This occurred about 550 million years ago. The earliest vertebrates may have been jawless fish, like the hagfish in Figure below . Vertebrates evolved a backbone to replace the notochord after the embryo stage. They also evolved a cranium, or bony skull, to enclose and protect the brain.
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