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Long before Darwin and Wallace, farmers and breeders were using the idea of selection to cause major changes in the features of their plants and animals over the course of decades. Farmers and breeders allowed only the plants and animals with desirable characteristics to reproduce, causing the evolution of farm stock. This process is called artificial selection because people (instead of nature) select which organisms get to reproduce.
As shown below, farmers have cultivated numerous popular crops from the wild mustard, by artificially selecting for certain attributes.
These common vegetables were cultivated from forms of wild mustard. This is evolution through artificial selection.
Broccoli image courtesy of Jeff Burke and Lorraine Triolo
Cabbage image courtesy of www.gristmagazine.com
Kale image courtesy of www.foodsubs.com
Kohlrabi image courtesy of Jozef Jarosciak
Cauliflower image courtesy of The Florida Department of Agriculture and Consumer Services
Mustard image courtesy of Gernot Katzer