You are presented with the quiz "humans have complete digestive systems and what bodies." 

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 "all of the chordates have elongated bilaterally symmetrical bodies". 

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


 

    bilateraly symmetrical       