Fact 1: Along tail can be used to move through water by an animal.

Fact 2: Water is made up of H2O molecules.

Given the two facts above, answer the question "what can animals use a long tail to move through?" with the following options: 
- beavers
 - rain
 - bogs
 - h2o
 - carbon
 - H20
 - oxygen
 - Aves


 

    h2o     