You are presented with the question "shellfish have a circulatory system with one or two hearts that pump what" and the following answer choices: 
- liquid
 - life
 - salt
 - food
 - matter
 - blood
 - oxygen
 - water

Now knowing that mollusks have a circulatory system with one or two hearts that pump blood and an abalone is a shellfish or mollusk, choose the best answer.


 

      blood   