Early wheat farmers, weeding by hand, pulled out and discarded the rye-weed to keep their planted crops healthy. So, to survive, a few rye plants took on a form more similar to wheat. Farmers still extricated the pesky rye, when they could spot it. This selective pressure molded the rye to evolve to trick a farmer’s discerning eye. In this case, only the best impressionists survived. Eventually, the rye became so excellent a mimic that it became a crop itself. “Vavilovian mimicry” is now a basic fact of agriculture.* Oats are a product of the same process; they also got their start mimicking
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