Question

what is open and close circulatory system?

Answer 1

Closed circulatory system 
Vertebrates, and a few invertebrates, have a closed circulatory system. Closed circulatory systems have the blood closed at all times within vessels of different size and wall thickness. In this type of system, blood is pumped by a heart through vessels, and does not normally fill body cavities. 
Open circulatory system 
The open circulatory system is common to molluscs and arthropods. Open circulatory systems (evolved in crustaceans, insects, mollusks and other invertebrates) pump blood into a hemocoel with the blood diffusing back to the circulatory system between cells. Blood is pumped by a heart into the body cavities, where tissues are surrounded by the blood. 

Answer 2

Hello! :)

Explanation:

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Open circulatory system pump blood into open spaces into the body.

Close circulatory system is a system in which blood is contained within blood vessels at all times.

Hope this helps!