The equilibrium price of oil has risen. why?

As a result of the columbian exchange, which crop was transferred to europe from the americas and later spread through the world? a coffee b maize (corn) c rice d olives e wheat

Which of the following is not true of american cowboys?

In in 1958, the aarp was organized to promote a mandatory retirement age of 65health insurance for retired americansactivism for native americansemployment opportunities for the disabled