What is population density? A.
the total number of people living in a certain area
B.
the average number of people in a given area
C.
the rate at which the world’s population is expected to grow
D.
the cultural or ethnic breakdown of people living in a country

A. the total number of people living in a certain area.

Migration people get up and go cause they feel it is best for them 

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!