You are presented with the question "_ are used for moving people across bodies of water." and the following answer choices: 
- dolphins
 - engines
 - gas turbines
 - electricity
 - streams
 - rivers
 - arteries
 - animal transport

Now knowing that aairplane is used for moving people across bodies of water and most airplanes use gas turbines, choose the best answer.


 

   gas turbines      