The discovery of farming marked the break between what two time periods

Which fact would this be, and how might you verify the truth?

What was the difference between bombing military targets in the united kingdom, and bombing the city of london? a. bombing a city kills lots of innocent civilians, bombing a military target doesn't b. bombing military targets didn't force the u.k. to surrender, but bombing london did c. military targets were bombed by japan, while london was bombed by the nazis d. london was bombed before the u.s. entered the war; military targets were bombed afterward

The mongols were descendants of a. pastoral nomadic tribes b. tibetan tribes c. shang nobility