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around 200 species

radial symetry with disc in middle and arms sticking out

They stick there stomach out and digest prey outside of body

feed on muscles clams ad oysters

can live up to 35 years

Use camouflage and color to defend themselves

Unique trait is they can turn their stomachs inside out

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Echinoidea (sea urchins and sand dollars)

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Echinoidea (sea urchins and sand dollars)

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Echinoidea (sea urchins and sand dollars)

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over 900 species with a radial body plain

have teeth and eat algae and kelp

can live for several years

have sharp spines for defense

Unique trait is their tube feet which work like hydraulics.

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Ophiuroida (brittle stars and basket stars)

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Ophiuroida (brittle stars and basket stars)

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over 2000 species have a center disc and five long arms

Eat a lot of things anything they can get hands on algae dead fish fragments eat with pushing stomach out

Live up to 5 years

can detach limbs for defense

one unique trait is they can regenerate their limbs

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over 600 species

radial plane have a center and a lot of arms

are filter feeders and trap their food in arms

can live up to 4 years

have spiny surfaces that can be toxic

have fossils up to 450million years old

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around 1800 species

cylindrical body radial symmetrical

bottom feeders sift through bottom

have tentacles to help

can live up to ten years

release sticky tubules for defense

unique trait is they can reproduce organs