They have a closed circulatory system.
Most mollusks have a closed circulatory system. However, cephalopods have an open circulatory system.
never mind i found the answer :D
An open circulatory system.
A closed circulatory system
Closed Circulatory system
closed circulatory system
Closed circulatory system I believe.
They have a closed circulatory system.
closed circulatory system.
closed circulatory system.
earthworms have a closed circulatory system
earthworms have a closed circulatory system