In comparison, storing wheat is easier and wheat last longer than Taro roots and bananas, which increases the amount of the food available during winter. In addition, wheat provide more protein than Taro roots and bananas. The New Guineans raises pig, which can only provide meat and fat, but they don't raise other types of livestock. According to Dr. Jared Diamond's statistic, the civilizations around the world have 14 types of livestock. In Eurasia, there are 13 out of 14 types of livestock, such as horse, cow and sheep. Dr. Diamond explains that those livestock can provide not only meat but milk, leather and horse power. Milk is rich in protein, which can be easily collected, cheese is easier to store than pork. Leather keeps people warm so that they will have more energy to work. Horse power from the livestock allows people to farm more land by using less human power, which lets people put more time and effort into developing their civilization by researching, casting tools or weapons, publicizing and educating their citizens. .
Additionally, scholars believe that the Fertile Crescent was the site where human civilization arose. In that case, Diamond's theory about geography matches the reasons why Fertile Crescent is more developed than other ancient places during the same period. Firstly, as Dr. Diamond notes, latitude deeply affects the weather and the amount of cultivable land on the Fertile Crescent. The Fertile Crescent is located on the subtropical area according to its latitude, which means frequently rain provided unlimited drinkable water on the land. The lands should be fertile to plant in the Fertile Crescent, the place should be rich in biodiversity that contains uncountable types of animals and plants. Those advantages provide the ancient people on the Fertile Crescent more resources to start building their civilization. .
The topography of Eurasian continent also allowed civilization to develop.
