As a result of the Neolithic Revolution, by 3,000 BCE the world’s human population grew to

five hundred thousand.
one million.
twenty-five million.
seventy-five million.

By 3,000 BCE, the world's human population grew to approximately twenty-five million as a result of the Neolithic Revolution.

As a result of the Neolithic Revolution, by 3,000 BCE, the world's human population grew to one million.