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Which classes are commonly grouped under the phylum CHORDATA?
AFishes, amphibians, reptiles, birds AND mammals — based on common features like presence of notochord and dorsal hollow neural system
BOnly birds and mammals
COnly mammals
DInsects and crustaceans
Answer & Solution
Correct answer: A. Fishes, amphibians, reptiles, birds AND mammals — based on common features like presence of notochord and dorsal hollow neural system
Chordata is defined by notochord + dorsal hollow nerve cord (among other features). It includes fishes, amphibians, reptiles, birds and mammals. Insects/crustaceans are in phylum Arthropoda.
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