Class Reptilia includes all the reptiles while Class Aves includes all birds.However,a cladistics approach would place birds into the same class with the reptiles.Why would a cladistician do this despite the behavioral and physical differences between birds and reptiles?

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The Answer of Class Reptilia includes all the reptiles while Class Aves includes all birds.However,a cladistics approach would place birds into the same class with the reptiles.Why would a cladistician do this despite the behavioral and physical differences between birds and reptiles?

Class Reptilia Includes All the Reptiles While Class Aves Includes