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open circulatory system
a circulatory system in which the heart pumps blood into open spaces in the body, and blood is not confined to blood vessels
a waxy, waterproof outer shell or outer skeleton that protects the animal and helps prevent evaporation of water
an arthropod that has two or three body sections, five or more pairs of legs, and two pairs of antennae
a process in which an animal's body undergoes dramatic changes in form during its life cycle
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