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As time advanced people were becoming specialized workers or laborers. Instead of just being hunter and getting food people were learning how to plant and build granaries and make weapons. Over time domestic animals became important to life, certain animals could produce milk, fur for clothing, meat and feces for fertilizer. Goat, sheep, pigs and cows were the first animals to be domesticated by humans. Each animal had something special to offer, oxen and horses were used to plow fields which increased the amount of food you could plant, grow, store and produce. In new guinea the only muscle power were from humans. They didn't have big strong animals like oxen or horses to pull plows. The best animals to farm are large land eating animals that can reproduce within the first few years of life and weigh over 100lbs. New Guinea just had bad geographic luck that’s all, I'm 100% sure and I'm sure experts agree too that New Guineans are perfectly capable of accomplishing the things that others have if the y had the tools.