You are presented with the question "What can move through water?" and the following answer choices: 
- pebbles
 - crocodiles
 - leeches
 - stones
 - rocks
 - Jellyfish
 - mussels
 - Nematoda

Now knowing that along tail can be used to move through water by an animal and crocodiles swim mostly with their tails, choose the best answer.


 

  crocodiles       