Which of the following contributed to the doubling of the Chinese population during the Tang and Song dynasties?

Which physical feature minimizes population density in northern africa?

Jackson pollock described his art style in the following quote: “new needs need new techniques.… it seems to me that the modern painter cannot express this age, the airplane, the atom bomb, the radio, in the old forms of the renaissance or of any other past culture. each age finds its own technique.” what point is pollock making about the new styles of art?

Why did kennedy choose lyndon b. johnson to be his running mate