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

Fact 2: An abalone is a shellfish or mollusk.

Given the two facts above, answer the question "shellfish have a circulatory system with one or two hearts that pump what" with the following options: 
- liquid
 - life
 - salt
 - food
 - matter
 - blood
 - oxygen
 - water


 

      blood   