You are presented with the quiz "What are bacteria and algae that use sunlight to make food?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "phytoplankton are bacteria and algae that use sunlight to make food" and "planktonic plants are called phytoplankton". 

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


 

     planktonic plants      