<u>Copper....................</u>
Among the options, the best is: (3) an increase in population.
Neolithic Revolution was the agrarian Revolution, meaning that a large scale change in the way people obtained food took place: they no longer primarily hunted and gathered food (so option 4 is incorrect) but instead they focused on agriculture and keeping domesticated animals. This was more efficient and allowed for an increase in population.
The first president of the United States was George Washington
