judging by demographic patterns of recent years, we can surmise that the principal reason for declining natural increase rates in less developed countries today is

D.haka is the first answer and a.canberra is the second answer

Aregion is an area of land that has common features. these features can be natural, such as climate or landscape. they can also be artificial, such as language or religion. the xinjiang uyghur autonomous region, above, is an area of china inhabited by uyghurs, a muslim group with ethnic ties to turkish people.

Answerair masses develop near the equator are warm; tropical air mass