You are presented with the question "What helps an animal move through a river better?" and the following answer choices: 
- salinity
 - scales
 - long snout
 - long tail
 - contracting
 - stamina
 - long fur
 - four limbs

Now knowing that along tail can be used to move through water by an animal and water remains in the current of the river, choose the best answer.


 

    long tail     