You are presented with the question "A platypus is an example of " and the following answer choices: 
- a reptile
 - animals
 - an amphibian
 - a monotreme
 - killing insects
 - insects
 - murmur
 - an arachnid

Now knowing that monotremes are mammals that reproduce by laying eggs and like the platypus, an echidna is an egg laying mammal, choose the best answer.


 

    a monotreme     