You are presented with the quiz "A habitat for several rare plant species is formed by the wind transporting and depositing what?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "sand dunes are formed by the wind transporting and depositing sand" and "sand dunes provide a habitat for several rare plant species". 

So, what's the best answer to the question?


 

       sand    