Which two observations can be made in relation to population growth over centuries?
a. the world population began declining after world war i and world war ii.
b. in the twentieth century alone, the world population grew by more than 5 billion people.
c. population grew slowly until the eighteenth century because death rates were higher.
d. poverty, employment, and living standards are not affected by population growth.

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.

Which statement about this figure is false

Describe the four major spheres of the earth system; identify the parts of the earth they each represent. explain what is meant by the "earth system."