What evidence is there of early people being able to specialize in doing activities which made life better for the whole society?

Why is paper currency considered flat money ? a) it is backed up with gold and silver deposits b) it has value because people will accept it in exchange for a good or service c) it is easy to carry and transfer

The north had all of the following advantages over the south, excepta expansive industry to maintain their economyb. a large number of educated professional officers and soldiersc. a strong central governmentd. control over the major trade routes select the best answer from the choices provided

What was the direct cause of the u.s. entry into world war ii? a. the bombing of pearl harbor b. the invasion of poland by germany c. the capture of belgium by germany d. the battle of britain