Arthropod (Lobsters)
Arthropods are any member of the phylum Arthropoda, which is the largest in the animal kingdom. These divide into three non-extinct classes: Chelicerates, Crustaceans, and Uniramians. They are mainly defined by their segmented bodies, exoskeletons, and appendages. Their outer tissue layer secretes protein and a nitrogenous carbohydrate called chitin, which form the thin and flexible exoskeleton. This happens overtime as they undergo metamorphosis and become hard-bodied adults.
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