Which class includes birds?

Which class includes birds?

• A. Mammalia
• B. Reptilia
• C. Amphibia
• D. Aves

Answer: (D)

Birds are placed in their own vertebrate class, Aves. This grouping reflects defining features of birds such as feathers, a beak, and the production of hard-shelled eggs, along with their typical metabolism that supports flight in many species. Among the options, only Aves describes birds. The other classes refer to different groups: Mammalia are animals with hair and mammary glands; Reptilia includes reptiles with scaly skin and generally ectothermic metabolism; Amphibia comprises frogs and salamanders with moist skin and a life cycle that includes metamorphosis.

Birds are placed in their own vertebrate class, Aves. This grouping reflects defining features of birds such as feathers, a beak, and the production of hard-shelled eggs, along with their typical metabolism that supports flight in many species. Among the options, only Aves describes birds. The other classes refer to different groups: Mammalia are animals with hair and mammary glands; Reptilia includes reptiles with scaly skin and generally ectothermic metabolism; Amphibia comprises frogs and salamanders with moist skin and a life cycle that includes metamorphosis.