At the very dawn of the agricultural revolution in the Fertile Crescent, farming and herding had already been adopted by unrelated groups (sciencemag.org)
Unrelated groups adopted farming at about the same time in different parts of the Fertile Crescent. (science.sciencemag.org)
Two other types of animal in those reefs also had mineralized parts, which suggests that multiple, unrelated groups evolved skeletal shells around the same time. (scientificamerican.com)