The document summarizes the characteristics of different invertebrate groups. It describes that invertebrates lack a spinal column or internal skeleton. It then outlines the key characteristics of mollusks, arthropods, echinoderms, jellyfish and polyps, sponges, and annelids. For mollusks, it notes they have a hard shell and mantle. Arthropods have an exoskeleton and jointed bodies. Echinoderms live in the ocean and move via tiny suction cup feet. Jellyfish and polyps are carnivorous ocean dwellers that use tentacles to trap prey. Sponges cannot move and filter water. Annelids are soft-