You are presented with the quiz "Why are marine fossils in the interior of a continent?" 

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 "marine fossils found in the interior of the continent". 

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


 

  It used to be covered by water         