AP BIOLOGY

Detailed explanation-1: -However, the vast majority of animal life on our planet is made up of animals without backbones: the invertebrates. Of the approximately 35 phyla in the kingdom Animalia, only one phylum-the phylum Chordata-contains animals that have backbones.

Detailed explanation-2: -The most familiar invertebrates include the Protozoa, Porifera, Coelenterata, Platyhelminthes, Nematoda, Annelida, Echinodermata, Mollusca and Arthropoda. Arthropoda include insects, crustaceans and arachnids.

Detailed explanation-3: -Nine phyla represent the list of invertebrates: Porifera, Cnidaria, Platyhelminthes, Nematoda, Rotifera, Mollusca, Annelida, Arthropoda, & Echinodermata.