You are presented with the quiz "A prehistoric shark tooth found discovered high in the mountains likely indicates what?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "if fossils of a water animal or plant are found in a place then that place used to be covered by water in the past" and "generally, mountains are good places to find fossils". 

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


 

 The area was once underwater          