Which two individuals were responsible for creating better and more efficient means of long-distance communication?

Which of the following statements best characterizes changes to agriculture in the united states since 1900? a. increased mechanization has reduced the need for labor.b. increased mechanization has increased the need for water, thereby increasing the need for labor.increased mechanization has increased the use of land, thereby increasing the need for labor.d. increased mechanization has increased food production, thereby increasing the need for labor. select the best answer from the choices provided.

Acountry that is changing its economic focus from agriculture to industry has a economy. a. mixed b. command c. developing d. traditional (not d)

How has plate tectonics affected the climate of south america?