You are presented with the quiz "What do biologists study?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "microscope is used to see small things by biologists by making them appear bigger" and "biologists use microscopes to study things that are too small to be seen with the unaided eye". 

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


 

  Small things with a microscope         