Fact 1: Fish have a circulatory system with a two-chambered heart.

Fact 2: Fish Fish are the ultimate aquatic organism.

Given the two facts above, answer the question "the ultimate aquatic organism has a circulatory system with a how many chambered heart.?" with the following options: 
- ligt
 - moss
 - Frog
 - tube
 - clam
 - two
 - size
 - Aves


 

      two   