They have a closed circulatory system.
Their circulartion system is very similar to humans (closed circulatory system)
A Strange but interesting one From Anonymous
An open circulatory system.
A closed circulatory system
Closed Circulatory system
They have a closed circulatory system.
closed circulatory system
Closed circulatory system I believe.
closed circulatory system.
closed circulatory system.
earthworms have a closed circulatory system
earthworms have a closed circulatory system