Which statements about the circulatory system of a mollusk are true?

select all that apply.

a
gas exchanges takes place by diffusion.

b
it is an open system.

c
it is a closed system.

d
blood moves through the sinuses into the gills for gas exchange

Answer;

A. Gas exchanges takes place by diffusion.

B. It is an open system.

Explanation;Most molluscs and arthropods have an open type of circulatory system. Open circulatory systems 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.

The answer would be generation