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

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

Given the two facts above, answer the question "Platypus and Echidna are mammals that reproduce by what?" with the following options: 
- hospital visits
 - cesarean sections
 - organs
 - warm-blooded
 - fur and fat
 - live birth
 - competition
 - laying eggs


 

        laying eggs 