Question

Give the difference between open and closed circulation.​

Answer 1

Open circulation	Closed circulation
Blood pumped by the heart passes through large vessels into open spaces or body cavities.	Blood pumped by the heart is always circulated through a closed network of blood vessels.
The tissues of the body are in direct contact with the blood.​	The tissues are not in direct contact with the blood.​
This is primitive circulation.	This is advanced circulation.
Example: Arthropods, Mollusca, and more.	Example: All vertebrates, Some invertebrates like earthworm and more.