Final answer:
Around 14,000 years ago, humans began domesticating plants like wheat and barley in the Old World and animals like llamas in the New World starting 10,000 years ago.
Step-by-step explanation:
About 14,000 years ago in the Old World, primarily in the Fertile Crescent area of the Middle East, and 10,000 years ago in the New World, in regions such as Mesoamerica, humans began the domestication of plants and animals. This period is often referred to as the Neolithic Revolution. In the Old World, domestication of edible wild grasses led to the cultivation of crops like wheat and barley. Meanwhile, in the Americas, the domestication of plants such as maize (corn) and later beans, squash, and peppers occurred. Animal domestication included camelids like llamas in the Andean region, as well as the guinea pig for food.