Particular fauna and flora were innate suited to domestication providing useful food sources. With expansive yet condensed populations, animal husbandry provided a rich, stable food supply. An example of early animal domestication is of North African cattle in c. 8000 BCE in the Sahara desert when it had adequate water sources. Additional animals that were domesticated over 7000 years ago included camels, chickens, horses, goats, sheep, llamas and buffalo. Common crops included maize, rice, wheat and millet.
The major benefit of animal husbandry and agriculture was the stable food supply that enabled more people to survive childhood and eat regularly. In addition to heightened food resources, agriculture encouraged the trade of food, even animals, for manufactured goods and rare commodities. A prevalent disease shared between animals and humans is influenza which spreads quickly and can survive multiple environmental types. During the European conquest, pigs carrying Eurasian diseases made first contact with the people of the Americas. A highly devastating reaction was experienced by the people