Fact 1: Amphibians have a relatively complex circulatory system with a three-chambered heart.

Fact 2: Blood is pumped around the body by a heart .

Given the two facts above, answer the question "What do amphibians pump around the body in a complex manner?" with the following options: 
- SO2
 - food
 - Energy.
 - oxygen
 - Energy
 - thoughts
 - blood
 - water


 

       blood  