Fact 1: Mollusks have a circulatory system with one or two hearts that pump blood.

Fact 2: Mollusks have a simple heart, which pumps the blood throughout the body.

Given the two facts above, answer the question "What do mollusks hearts circulate through the body?" with the following options: 
- liquid
 - Energy
 - complex
 - food
 - water
 - blood
 - grass
 - oxygen


 

      blood   