Question

define the closed and open circulatory systems with examples

Answer 1

Closed circulatory system is that in which blood flows through arteries and veins and an open circulatory system is that where arteries and veins are absent

Answer 2

Blood in our body circulates in a closed manner, i. e, all the time through blood vessels. Such a type of blood circulation is called closed circulatory system.
In certain animals such as insects, the blood mostly flows through open spaces, called an open blood circulatory system.