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A common characteristic of all vertebrates is

1. presence of skull
2. division of body into head, neck, trunk and tail
3. presence of two pairs of functional appendages
4. body is covered with an exoskeleton

Correct answer: presence of skull

Solution

All vertebrates have a vertebral column and a skull, which together form the endoskeleton. The skull is the universal trait among vertebrates here; the other options are not shared by all groups.

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