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B
Chordates
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C
Hemichordates
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D
Both A and B
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Solution
The correct option is B
Chordates
All animals that possess a notochord are called chordates. Vertebrata is a sub-phylum under Phylum Chordata and are hence, "vertebrate" is not synonymous to "chordate". Vertebrates possess notochord during the embryonic period. The notochord is replaced by a cartilaginous or bony vertebral column in the adult.