Question

"All vertebrates are chordates but all chordates are not vertebrates". Justify this statement.
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Answer 1

In sub phylum vertebata
The notchord present in embryos get replaced by a cartilaginous or bony vertebral columns in adults. .
Thus it can be said that " ALL VERTEBRATES ARE CHORDATES BUT ALL CHORDATES ARE NOT VERTEBRATES".....

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Answer 2

All vertebrates are chordates but all chordates are not vertebrates justify the statement

Answer => members of the subphylum vertrebrata possess notochord during their embryonic period.hence thus the notochord is being replaced by a bony vertebral column in the adult