Given below are two statements : One is labelled Assertion A and the other is labelled as Reason....

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Given below are two statements : One is labelled Assertion A and the other is labelled as Reason R
Assertion A: Members of subphylum vertebrata possess notochord during the embryonic period. The notochord is replaced by a cartilaginous or bony vertebral column in the adult.Reason R: Thus all chordates are vertebrates but not all vertebrates are chordates.
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