In what way did the railroads give people control of the environment?

Which statement best describes the weather shown by the red semi circles on a line on a weather map a warm front brings drizzly weather a cold front can cause heavy rain, thunder, and lightning a stationary front may produce rainy or snowy weather for several days an occluded front can cause light to heavy precipitation that may last several days

Define production possibility curve

As of 2013, the world’s total population was about