Read the following statements and choose the correct one for the members of subphylum Vertebrata.
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a
They possess notochord during the adult stage.
b
They do not possess notochord during the embryonic period.
c
They do not possess notochord either in embryonic period or in the adult stage.
d
They possess notochord during the embryonic period.
answer is D.
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Detailed Solution
The members of subphylum Vertebrata possess notochord during the embryonic period. The notochord is replaced by a cartilaginous or bony vertebral column in the adult. In some others like cephalochordates, notochord is persistent throughout the life.