Which of the following statements is incorrect regarding the open circulatory system?

Which part of the circulatory system serves to supply blood to the heart muscle itself?

What type of circulatory system is present in humans?

Given below are two statements regarding the circulation of blood in fishes.
Statement $I$: The heart of a fish contains only deoxygenated blood.
Statement $II$: Fishes show single circulation,and blood passes through the heart only once during each cycle.
In light of the above statements,choose the correct answer from the options given below.

Which of the following represents the correct pathway of blood circulation in the human heart?

Double circulation occurs in