Question

"All vertebrates are Chordates but all Chordates are not vertebrates " Justify the statement.











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Answer 1

Answer:

All vertebrates have notochord at any stage of their stage i.e. during their embryonic period. So they are also chordates.

But all chordates are not vertebrates because all of them do not have their notochord replaced by vertebral column in adult stage of their life. Like urochordates have notochord in larval tail and cephalochordates have notochord persistent throughout their life but no vertebral column. So they are not vertebrates.

Hence, all vertebrates are chordates but all chordates are not vertebrates.

Answer 2

Answer:

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The members of sub-phylum - Vertebrata possess notochord during the embryonic stage. But in adults the notochord is replaced by a cartilaginous or bony vertebral column. ... Thus, the absence of notochord in adult vertebrates suggest that all vertebrates are chordates but all chordates are not vertebrates.

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