Crabs and crayfish are crustaceans, a subdivision of arthropods - the large group of animals without backbones (invertebrates) that includes insects, spider, mites, scorpions and springtails. Arthropods have jointed ang a hard outer shell that acts as a skeleton
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Crabs
Crabs and crayfish are crustaceans, a subdivision of arthropods - the large group of animals without backbones (invertebrates) that includes insects, spider, mites, scorpions and springtails. Arthropods have jointed ang a hard outer shell that acts as a skeleton
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