What is the last answer ? I really need help ASAP, serious answers ONLY !

Aside from low birthrates and high death rates, what can cause a country’s population to decline

When conducting research for forming a hypothesis, which practice should historians follow?

Characteristics of what type of economic system are being described below? 1.economy in which some/all of the basic economic questions answered by central authority 2.trade generally limited to what is produced through the influence of the government a. command economies. b. market economies. c. traditional economies.