SAT Biology Subject Test Practice Questions

Answer: C, Amphibians. Frogs and salamanders are members of the class Amphibia, which includes newts and toads.

Key Takeaway: Amphibians are cold-blooded vertebrates characterized by metamorphosis from a juvenile water-breathing form into an air-breathing adult form. This metamorphosis separates amphibians from reptiles, which also are cold-blooded air-breathing animals.

Mammals are warm-blooded animals with mammary glands. Unlike reptiles and amphibians, mammals generally give birth to live animals. Arthropods are invertebrates with a hard exoskeleton and segmented bodies.

Bacteria are prokaryotic unicellular organisms. If a student is aware that frogs and salamanders are warm-blooded, he or she can eliminate three of the choices immediately.

Photo: Salamander, Steve Jurvetson