You are presented with the quiz "What is an example of a tetrapod vertebrate?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "reptiles are a class of tetrapod vertebrates that produce amniotic eggs" and "crocodiles, snakes, and lizards are all types of reptiles". 

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


 

    crocodile       