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

A. Gas exchanges takes place by diffusion.

B. It is an open system.

explanation:

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.

uh two lol