AP BIOLOGY

Detailed explanation-1: -Most species within the phylum Chordata are vertebrates, or animals with backbones (subphylum Vertebrata). Examples of vertebrate chordates include fishes, amphibians, reptiles, birds, and mammals. A modern human-one species of mammal-is a familiar example of a chordate.

Detailed explanation-2: -1) Chordata refers to a large phylum of animals that includes vertebrates as well as lancelets and sea squirts. Several well-known vertebrates, such as reptiles, fishes, mammals, and amphibians are included in the phylum Chordata.

Detailed explanation-3: -The phylum chordata (animals with backbones) is divided into five common classes: fish, amphibians, reptiles, mammals and birds.

Detailed explanation-4: -Chordates are divided into three subphyla: Craniata (fish, amphibians, reptiles, birds, and mammals); Tunicata or Urochordata (sea squirts, salps); and Cephalochordata (which includes lancelets).