You are presented with the quiz "What species of female mammal lacks a uterus and vagina?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "female monotremes lack a uterus and vagina" and "examples of monotremes are the Platypus and Echidna". 

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


 

  echidna         