Which features unite animals in phylum Chordata?
AHair and mammary glands
BFeathers and hollow bones
CJointed legs and exoskeleton
DNotochord and dorsal nerve cord
Answer & Solution
Correct answer: D. Notochord and dorsal nerve cord
Fishes, amphibians, reptiles, birds and mammals all have a notochord and a dorsal hollow neural system.
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