You are presented with the quiz "What provides food and shelter to many fish?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "coral reefs provide food and shelter to many ocean organisms" and "oceanic organisms other than fish, such as manatees and clams, are also subjects of the poems". 

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


 

 coral reefs          