AIIMS 2018 Biology Classification MCQ Question

Rattus (rats) and Felis (cats) are both classified under the phylum Mammalia, characterized by traits such as mammary glands and hair or fur. In contrast, Betta (a genus of fish) belongs to the phylum Chordata but is classified under the subphylum Vertebrata and the class Actinopterygii, which includes bony fish, thus excluding it from Mammalia. The other options are not applicable as they do not provide any additional information or alternatives relevant to the classification of these organisms. Understanding these classifications helps clarify the distinctions between different animal groups based on their evolutionary relationships.