What is closed circulatory system?

In closed circulatory system

In closed circulatory system

Why is closed circulatory system more efficient than the open circulatory system?

(a) In which groups of non-chordates would you find closed circulatory system ? (b) Why is closed circulatory system advantageous ?

Why is closed circulatory system advantageous ?

What is the closed circulatory system? Name two groups of animals having this types of circulation.

Which of the following has closed circulatory system?