The document provides information about different types of invertebrate animals. It states that 97% of animal species are invertebrates, meaning they lack backbones. Invertebrates include sponges, jellyfish, worms, mollusks, arthropods like insects, spiders, and crustaceans. Sponges have no organs and stay fixed in one place, while jellyfish have tentacles and can sting. Worms can regenerate lost body parts and come in many forms like flatworms, roundworms, and segmented worms. Mollusks include snails, clams, and squids, with some making shells and others having one or two shells. Arthropods are