1.

All vertebrates are chordates but all chordates are not vertebrates.

Answer»

Solution :All chordates POSSES 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 chordated . But some chordates LIKE Urochordata and CEPHALOCHORDATA do not possess vertebral column and hence they are not vertebrates.


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