A) chordates
B) vertebrates
C) invertebrates
D) in all of them
Correct Answer: A
Solution :
Chordates have three characteristic features-presence of dorsal nerve cord, the notochord and pharyngeal slits. Along with these, chordates also have a tail called post anal tail that extends beyond the anus, at least beyond their embryonic development. It is vestigial in apes and man and does not persists in the adults (frogs).
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