You are presented with the quiz "Amphibians with what are more advanced than fish?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "amphibians are the first true tetrapods, or vertebrates with four limbs" and "all vertebrates more advanced than fish have four limbs, each with up to five fingers or toes". 

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


 

     four limbs      