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A common characteristic of all vertebrates without exception isA. the division of body into head, neck, trunk and tialB. their body covered with an exoskeletonC. the possession of two pairs of functional appendagesD. the presence of well-developed skull.

Answer» Correct Answer - D
Vertebrates belong to the subphylum Vertebrata of the Phylum Chordata. All vertebrates share a common diagnostic character, the elaboration of anterior skeletal elements into a "cranium" or "skull" which houses various sense organs and a complex brain. The distinctive vertebrate cranium and brain evolved even before the vertebral column and are, therefore, more fundamental characteristic of vertebrates than the backbone.


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