You are presented with the quiz "what are found in place to indicate a place used to be covered by water?" 

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 "graptolites , in deep-water deposits, are the dominant fossils". 

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


 

     graptolites      