The document describes several types of invertebrates including sponges, jellyfish, worms, mollusks, and arthropods. Sponges have no organs or ability to move but live in oceans. Jellyfish have tentacles, mouths, and live on ocean floors. Worms can regrow parts and come in varieties like flatworms, roundworms, and segmented worms. Mollusks like snails and octopuses make shells and live in water or on land. Arthropods are the largest invertebrate group and include crustaceans, arachnids, insects, centipedes and millipedes which have exoskeletons and sensory organs.