Vertebrata are characterized by the presence of what?
- Correct Answer: Thumbs
- Bones
- Muscles
- backbone
Explanation: Figure 29.7 Vertebrata are characterized by the presence of a backbone, such as the one that runs through the middle of this fish. All vertebrates are in the Craniata clade and have a cranium. (credit: Ernest V. More; taken at Smithsonian Museum of Natural History, Washington, D.
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