I'll give brainliest!
the first cities and civilizations
the neolithic revolution led to the rise of civilization. a civilization is an advanced stage of human society marked by a well-organized government and high levels of culture, science, and industry. at different times in different parts of the world, food surpluses allowed some neolithic villages to grow into cities, the central feature of civilization.

river valley civilizations: the world's earliest civilizations developed independently in four river valleys. the civilization of sumer rose along the tigris and euphrates rivers in the middle east. a second river valley civilization developed along the nile river in egypt. the indus river in present-day pakistan was home to the indus valley civilization. a fourth river valley civilization, the shang, emerged along the huang, or yellow river in china. these four river valleys offered benefits to neolithic farmers. the soil was fertile, and the rivers provided a regular water supply as well as a means of transportation.

question
why was farming so crucial to the development of river valley civilizations, including those that flourished in egypt?