A country's population can decline with low birthrates and high death rates, but another factor that causes a country's population to decline is emigration. Emigration is the act of leaving the native country to settle in another!
The correct answer is: Another reason why the population of a country decreases is<u> the emigration </u>or displacement to other places by natural or human causes, for example: lack of resources for the support of all people, the appearance of diseases that reach the levels of pandemic or epidemic, the appearance of new and better opportunities in another place that makes it attractive for people to emigrate, a persecution, an armed conflict, a religious conflict and many others.
