You are presented with the quiz "Organisms that live in marine biomes must be adapted to most of the what on the planet?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "organisms that live in marine biomes must be adapted to the salt in the water" and "most of the water on the planet is salt water in the oceans". 

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


 

 water          