AP BIOLOGY

Detailed explanation-1: -A fish is an aquatic vertebrate with scales, fins, and gills. About 32, 000 fish species are known, divided into jawless fishes (agnathans), cartilaginous fishes (chondrichthyans), and bony fishes (osteichthyans).

Detailed explanation-2: -Fish and Other Aquatic Vertebrates are members of the subphylum Vertebrata who spend the majority of their lives in freshwater, marine, or estuarine environments.

Detailed explanation-3: -Amphibians are small vertebrates that need water, or a moist environment, to survive. The species in this group include frogs, toads, salamanders, and newts.

Detailed explanation-4: -Marine vertebrates are vertebrates that live in marine environments. These are the marine fish and the marine tetrapods (primarily seabirds, marine reptiles, and marine mammals).

Detailed explanation-5: -Vertebrates can be subdivided into five major groups: fishes, amphibians, reptiles, birds, and mammals. Fishes are almost all entirely aquatic, although there are a few species that can survive out of water for short periods of time.