Answer:
1.-triggers evolution of the species
2.-decreased genetic variation
Step-by-step explanation:
Artificial selection is when human observe a characteristic on certain plants or animals that are likeable or that better suits our necessities and starts to breed or reproduce specimens with those specific characteristics, one example of that are the pug dogs, they were artificially selected over the time and eventually came to look how they do today, this decreases genetic variation since the products of the artificial selection that do not match the desired characteristics are left to day or its reproduction is stopped.