Chordata is defined by a notochord and a dorsal hollow:
ANeural suture
BNeural system
CNeural septum
DNeural socket
Answer & Solution
Correct answer: B. Neural system
1. Fishes, amphibians, reptiles, birds and mammals share these features.
2. They are included in phylum Chordata on the basis of a notochord and dorsal hollow neural system.
3. So the correct answer is neural system.
_Source: NCERT Class 11 Biology, Ch 1 'The Living World'_
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