Answered

12. Which characteristic is unique to vertebrates?

A. They have bilateral symmetry.
B. They have no defined organ systems.
C. They have a well-defined skeleton.
D. They have an exoskeleton.



Answer :

GinnyAnswer

Final answer:

Vertebrates are unique in possessing a well-defined skeleton, particularly a bony endoskeleton with a backbone.


Explanation:

The characteristic unique to vertebrates is that they have a well-defined skeleton, specifically a bony endoskeleton with a backbone. This backbone, or vertebral column, provides support, protection for the spinal cord, and allows vertebrates to maintain their shape.


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