Which characteristic is unique to vertebrates? A) they all have a well-defined skeleton B) they have no defined organ

Which characteristic is unique to vertebrates?

A) they all have a well-defined skeleton

B) they have no defined organ systems

C) they have bilateral symmetry

D) they have an exoskeleton


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  1. Answer: They have well-defined skeleton.

    Explanation:

    This is because the vertebrates are uniquely characterised by the presence of the bones.

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