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प्रश्न
Give one point of difference between notochord and nerve cord.
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उत्तर
Notochord is ventral and its cells are filled with semi-fluid, whereas nerve cord is dorsal and hollow.
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Assertion (A): All vertebrates are chordates but all chordates are not vertebrate.
Reason (R): The members of subphylum vertebrata possess notochord, during the embryonic period, the notochord is replaced by a cartilaginous or bony vertebral column in adults.
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