Monotremes are mammals that reproduce by laying eggs, and examples of monotremes are the Platypus and Echidna. Given these facts, platypus and Echidna are mammals that reproduce by what among the following options:
- hospital visits
 - cesarean sections
 - organs
 - warm-blooded
 - fur and fat
 - live birth
 - competition
 - laying eggs


 

        laying eggs 