What is the per capita GDP of the United States? Be sure to indicate the calendar year that this information represents.

What would a student most likely use if he or she wanted to consult a secondary source

All living things share certain characteristics. which of the following characteristics is not shared by all living things?

Why do you think that historians use the word “revolution” to describe important changes in agriculture? how did the green revolution and other agricultural revolutions change the lives of billions of people? < < read less