Fact 1: Female monotremes lack a uterus and vagina.

Fact 2: Examples of monotremes are the Platypus and Echidna.

Given the two facts above, answer the question "What lacks a uterus and vagina?" with the following options: 
- Conifers
 - rats
 - humans
 - mammals
 - echidnas
 - kalenchoes
 - alpacas
 - barnacles


 

     echidnas    