These north american countries attract a large number of immigrants due their high standards of living.

canada
greenland
mexico
u. s.

"Canada" and "U. S." are the two North American countries among the following choices given in the question that attract a large number of immigrants due their high standards of living. The correct options among all the options that are given in the question are the first and the fourth options.

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!

1. antarctica2. saudi arabia