Fact 1: Monotremes are mammals that reproduce by laying eggs.

Fact 2: Well, platypuses are mammals, and they lay eggs.

Given the two facts above, answer the question "A platypus is an example of _." with the following options: 
- Marsupial.
 - Monotremes.
 - insects
 - animals
 - killing insects
 - Amphibian.
 - Placental mammal.
 - matter vibrating


 

  Monotremes.       