Question -Which of the following is not a character common to all chordates?
Options:
A .  Gill slits
B .  Notochord
C .  Dorsal hollow nerve cord
D .  Hair
Answer: Option D : D The primary chordate characteristics include notochord, dorsal hollow nerve cord, paired pharyngeal gill slits and post-anal tail. The presence of hair is a characteristic feature of mammals.
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