You are presented with the quiz "Where do organisms cluster on the ocean floor?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "organisms cluster around hydrothermal vents in the ocean floor" and "hydrothermal vents are fissures in the ocean floor that leak hot, acidic water". 

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


 

    fissures of hot, acidic water       