A) two pairs of pentadactyl limbs
B) pharyngeal gill slits
C) movable jaw
D) vertebral column
Correct Answer: B
Solution :
In all the chordates, at some stage of their life history, a series of paired lateral gill clefts or gill slits perforate through the pharyngeal wall of the gut behind the mouth. They serve primarily for the passage of water from pharynx to outside.
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