You are presented with the question "what can animals use a long tail to move through?" and the following answer choices: 
- beavers
 - rain
 - bogs
 - h2o
 - carbon
 - H20
 - oxygen
 - Aves

Now knowing that along tail can be used to move through water by an animal and water is made up of H2O molecules, choose the best answer.


 

    h2o     