A) the division of body into head, neck, trunk and tail.
B) body covered with exoskeleton.
C) the possession of two pairs of functional appendages.
D) the presence of well - developed skull.
Correct Answer: D
Solution :
[d] The sub-phylum vertebrata (or craniata) have a well-developed nervous system that is differentiated into brain and spinal cord. Brain is protected by a brain box called cranium, so they are also called as craniata.
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