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Per NCERT, what TWO defining features unite the phylum CHORDATA?
AWings and feathers
BRoots and leaves
CPresence of NOTOCHORD and DORSAL HOLLOW NEURAL system
DSkin and lungs
Answer & Solution
Correct answer: C. Presence of NOTOCHORD and DORSAL HOLLOW NEURAL system
Per NCERT §1.2.6, Chordata = notochord + dorsal hollow nerve cord. Fish, amphibians, reptiles, birds, mammals all share this.
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