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The crustacean is not one organism. It is a subphylum of arthropods. It involves crabs, lobsters, shrimp, crayfish, krill and barnacles. They all use claws to catch food except krill, shrimp and barnacles. The others use the hairs on their legs to catch microorganisms like phytoplankton swimming around in the ocean and eat them.

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13y ago

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