You are presented with the question "What does a platypus lack?" and the following answer choices: 
- a cuticle
 - Uterus
 - tail fins
 - Eyes
 - Tail
 - Energy.
 - Energy
 - Heart

Now knowing that female monotremes lack a uterus and vagina and like the echidna, a platypus is a monotreme, choose the best answer.


 

  Uterus       