Answer:
Artificial Selection. People used their best crops to get the seeds for their next crop.
This process is what is known as artificial selection.
In this process people would have to identify desirable traits in these crops and then try to enhance these traits in a newer generation of crops for bigger and tastier farm yields.
It is called artificial selection because of the intervention of human beings in the process. The crop species are not left alone to evolve or change on their own.
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