You are presented with the quiz "what have a complete digestive system and closed circulatory system?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "chordates have a complete digestive system and a closed circulatory system" and "yep, lizards are chordates, just like humans". 

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


 

    lizards       