Which piece of evidence did alfred wegener use to develop the theory of continental drift?
a. undersea mountain ranges
b. basalts on the ocean floor
c. paleomagnetism on the seafloor
d. similar fossils on different continents

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.