You are presented with the quiz "What must be adapted to the salt in the water?" 

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 "marine life is equally diverse and abundant, from tiny plankton to blue whales". 

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


 

  blue whales         