These sea creatures have stinging tentacles used to catch prey. , Cnidarians:, They live on the seabed. They are the simplest of the invertebrates and have no organs. Their bodies have openings that let food and oxygen in., Sponges:, These sea creatures are symmetrical. Some examples are sea stars, sea urchins, and sand dollars., Echinoderms:, They have soft bodies and no legs. Some have tentacles. They usually live inside a shell. Some examples are snails, slugs, clams, octopuses, and squids., Mollusks:, They have a long, soft body and no legs. There are in different groups., Worms:, They from the largest group of invertebrates. They have a hard covering outside their bodies, called an exoskeleton. Insects, spiders, scorpions, and centipedes are all of this group. They have six or more legs., Arthropods:.
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