Mollusks have a circulatory system with one or two hearts that pump blood.
Clams are mollusks that live in the sea or in freshwater.
Clams have a circulatory system with one or two hearts that pump blood.
what have a circulatory system with one or two hearts that pump blood
Options:
a: a fish
b: aorta
c: bacteria
d: animals
e: clams
f: plants
g: sharks
h: Birds