Wheat is a dry climate crop.
Winter wheat is planted in milder climates, spring wheat in the north.
Bulky item, best suited to water or rail transport. U.S. and Canada major exporters, China a major producer but for domestic consumption only. Sheep can live in hillier and drier conditions than cattle. Livestock ranching is extensive, i.e., requires a lot of land. Carrying capacity is the measure of what the land will support.