Question

All vertebrates are chordates but all chordates are not vertebrates.​

Answer 1

Answer & explanation.

Notochord is a characteristic feature of all chordates. The members of subphylum Vertebrata possess notochord during embryonic stage. But in all adults the notochord is replaced by a cartilagenous or bony vertebral column. Whereas, in member of other sub-phyla of chordata the notochord remain as such. The urochordata and cephalochordata retain the notochord during their entire life cycle. Thus, the absence of notochord in adult vertebrates suggest that all vertebrates are chordates but all chordates are not vertebrates.​

Answer 2

Answer:

All chordates possess notochord in some period of their development. All vertebrates also have notochord during embryonic life, which is later replaced by vertebral column. therefore all vertebrates are chordates but some chordates like Urochordates and Cephalochordata do not possess vertebral column and hence they are not vertebrates.

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