Which is one way that the Neolithic Revolution contributed to the development of ancient river valley civilizations?

The Neolithic Revolution, also called the Agrarian Revolution, was the change from a nomadic, hunter-gatherer lifestyle to a settled, agrarian one with farming. Farming is more stable and secure and it gives people more time to engage in other activities, such as improving their tools and developing cultures: the neolithic Revolution contributed to the technological development in the river valley civilisations by giving people time to improve on their technology.

As humans developed agriculture, they were able to stop following herds of animals and build towns and cities. (apex)