The document discusses the major animal phyla: (1) Cnidaria include jellyfish and coral which have stinging cells and a simple structure without organs. (2) Annelida include segmented worms like earthworms and leeches. (3) Mollusks include snails, octopuses, and clams, many with shells. (4) Vertebrates make up the phylum Chordata, including mammals, birds, fish, amphibians, and reptiles with backbones.