The types of people who crossed the land bridge to settle in areas of north america were considered to be this?

They were considered to be Nomads

increases in demand are shown by a shift to the right in the demand curve. this could be caused by a number of factors, including a rise in income, a rise in the price of a substitute or a fall in the price of a complement.

which the answer is:

b

these civilizations were located around fertile rivers, where they could produce an abundance of crops