How is artificial selection used in agriculture?
Artificial selection is used to produce plants or animals with desired traits.
Artificial selection is used to produce plants or animals with desired traits and farmers have been doing this for decades. Many of the foods we consume today are very different from their ancestors because we have selectively chosen to breed and grow plants with desirable traits and not to invest and breed plants that we do not desire.
We often select traits that will make the species grow faster, grow larger, have brighter colors, be resistant to drought, and so forth.
Tomatoes once looked something like this:
Over time, we have selectively bred them to be the larger, red tomatoes most of us are familiar with now.
You can read about how the corn we consume today differs drastically from its ancestors here.