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- A crustacean is one of the class of
- arthropods that includes the CRAB, the
- LOBSTER, SHRIMP, WOODLICE, and barnacles.
- The external skeleton is made of protein and
- chitin hardened with lime. Each segment bears
- a pair of appendages that may be modified as
- sensory feelers (antennae), as mouthparts, or
- as swimming, walking, or grasping structures.
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- Subject by: Mervin Dykes
-