Question

All vertebrates are chordates but all chordates are not vertebrates. Why?

Answer 1

Answer:

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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Answer 2

Answer:

Notochord is a characteristic feature of all chordates. The members of sub-phylum - Vertebrata possess notochord during the embryonic stage. ... Thus, the absence of notochord in adult vertebrates suggest that all vertebrates are chordates but all chordates are not vertebrates.