You are presented with the question "ducks can move fast through the water due to their specialized what" and the following answer choices: 
- feet
 - speed
 - size
 - bills
 - Limbs
 - beaks
 - wings
 - Tail

Now knowing that webbed feet are used for moving faster through water by aquatic animals and all ducks have webbed feet, choose the best answer.


 

 feet        