The catalyst to the Neolithic Revolution was a change in climatic conditions, which became drier across part of the world. Agriculture was expanded (cereal cultivation and animal domestication were introduced). Agriculture´s development instead of hunting and gathering enabled human beings to live a more settled lifestyle. People started to live in groups, and this necessitated the need to have more complicated forms of communication. Agricultural development made people (the division of labor in a family set up) have more time to develop other crafts/skills to benefit individuals/society. The impact of the Neolithic Revolution was the rise of civilizations.