Fact 1: Female monotremes lack a uterus and vagina.

Fact 2: Monotremes are mammals that lay eggs.

Given the two facts above, answer the question "What do some female mammals lack?" with the following options: 
- epidermal
 - vision
 - uterus
 - alleles
 - fur
 - a cuticle
 - eardrum
 - alveoli


 

   uterus      