You are presented with the quiz "What was formed by exoskeletons?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "many corals secrete an exoskeleton that builds up to become a coral reef" and "australia's coral reefs, including the Great Barrier Reef, are no exception". 

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


 

     the Great Barrier Reef      