Why is the development of farming considered a revolution of human history? a. farming made it possible for people to travel greater distances because grain doesn't spoil as quickly as meat does. b. farming allowed humans to grow taller because a plant-based diet is healthier than a meat-based diet. c. farming allowed humans to make tools out of better materials like stone and metal rather than out of bone. d. farming gave humans a reliable source of food, and people domesticated plants and animals to better fit their needs.