Animals with a backbone are classified under the subphylum __________.
Vertebrata
In phylum Chordata, animals whose notochord is replaced by a vertebral column (backbone) in adults form the subphylum Vertebrata — fishes, amphibians, reptiles, birds and mammals.
Annelida (earthworms), Mollusca (snails) and Arthropoda (insects) are separate phyla of invertebrates without a backbone.
Hence, animals with a backbone are placed in the subphylum Vertebrata.
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