Which are factors that determine population growth?

1birth rate
2climate change
3death rate
4emigration
5tariff reduction
6immigration

Birth rate, death rate, emigration, immigration

81 is a composite number

Humid continental climate is found in the interior of continents between the 30 and 60 degrees latitude, but usually above the 40 degree line.   40 degrees north of the equator means less direct sunlight and therefore less warmth.   this climate is mainly found in the northern hemisphere since there are no major landmasses in the southern hemisphere.  if you live in northern indiana, you know all about humid continental because that is the climate type you have!