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Open Circulatory System
Blood circulation system in which blood moves through vessels and into open spaces around the body organs
Muscle on the bottom of most mollusks that allows them to move through their environment
Closed Circulatory System
Blood circulation system in which blood moves through the body in closed vessels
Movement through the water by pushing water out through a cavity in the organisms body
Thick, hard, outer covering that protects and supports arthropods bodies and provides places for muscles to attach
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