The document provides an overview of the animal kingdom phylum tree. It lists the major phyla including vertebrates, insects, mollusks, annelids like earthworms and leeches, velvet worms, arthropods like insects and crustaceans, echinoderms like sea stars and sea urchins, and tunicates like sea squirts. Vertebrates are a subphylum of chordates, and insects represent the largest phylum.