Which class includes amphibians?

Which class includes amphibians?

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

Answer: (B)

This question tests how vertebrates are grouped into major classes. Amphibians are grouped in the class Amphibia, which includes animals like frogs, toads, salamanders, and newts. A key trait is their life cycle: they typically begin life in water with gills and larval forms, then undergo metamorphosis to become air-breathing adults that usually have legs. They also have moist, permeable skin that can absorb water and oxygen, tying them closely to both aquatic and terrestrial environments. This combination of reproductive strategy and skin physiology distinguishes them from the other classes: birds have feathers, reptiles have dry scaly skin and usually lay eggs on land, and mammals have hair and mammary glands. So, the class that includes amphibians is Amphibia.

This question tests how vertebrates are grouped into major classes. Amphibians are grouped in the class Amphibia, which includes animals like frogs, toads, salamanders, and newts. A key trait is their life cycle: they typically begin life in water with gills and larval forms, then undergo metamorphosis to become air-breathing adults that usually have legs. They also have moist, permeable skin that can absorb water and oxygen, tying them closely to both aquatic and terrestrial environments. This combination of reproductive strategy and skin physiology distinguishes them from the other classes: birds have feathers, reptiles have dry scaly skin and usually lay eggs on land, and mammals have hair and mammary glands. So, the class that includes amphibians is Amphibia.