Early evidence of the use of agriculture comes from the Fertile Crescent, but also from Pakistan's Indus River Valley, China's Yellow River Valley, Mexico, the American southwest, and the Andes region of South America. Identify whether or not the following are effects of agriculture on human society. a- increased tradeb- new social groups such as landholders and peasantsc- a focus on domesticating and herding animalsd- more egalitarian society