You are presented with the question "What prevents erosion on dunes?" and the following answer choices: 
- streams
 - cacti
 - wind
 - LEDs
 - fibrous
 - grass
 - fibers
 - bamboo

Now knowing that sand dunes are formed by the wind transporting and depositing sand and dune grass is very important to the preservation of sand dunes, choose the best answer.


 

      grass   