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Unlike other Echinoderms, they have a soft body, rather than a harder shell. They also have a horizontal axis of symmetry.

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They can eject parts of their gut to scare off potential predators.

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They can live longer than 8 years.

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They grab their prey with their tentacles, and bring it to their mouths. They each plankton and other small particles.

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They have a spherical body shape, with the mouth and anus on different ends. They are long and worm-like.

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There are 1,850 known species.

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They unlike others, don't have arms, but they still have tube feet.

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They have the ability to regenerate after losing a body part to a predator.

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They can live more than 100 years.

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They have a beak that they use to scrape algae and other food off of rocks.

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They have a sphere shaped radial body. They also have tube feet covering most of the body.

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There are more than 1,000 known species.

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Some species have specialized spines that help them to swim.

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They can leave behind some of their arms, or stun their predators with intense lashes.

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They can live up to 5 years.

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They use their tube feet to grab their prey, and move it to their mouths. They eat small prey such as crustaceans and worms.

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They have fie part symmetry, with an internal calcium carbonate skeleton. They also have a water vascular system.

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There are 2064 known species.

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They usually have 5 arms, but can have up to 40 arms.

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They can shed their arms and regenerate later. Some species also have sharp spines on their arms.

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They can live up to 35 years.

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They grab their prey with their tube feet, evert their stomach, and completely digest it before their stomach goes back into their body. They eat slow prey, such as barnacles, bivalves, and gastropods.

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They have radial symmetry, with flat center disc, and arms extending from that disk.

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There are over 1800 known species.

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They have a water vascular system, and they have a branching nervous system.

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They have good camouflage, and can regenerate. They also have a bad taste to repel predators.

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They have an average life span of 15 years.

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They are filter feeders, they use their tube feet to move particles towards they mouth. They eat plankton and other small particles.

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A central plate holding internal organs, and they have feather arms that come off from the central plate.

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There are about 700 living and known species.