This region in South America has faced all of the following challenges recently except:

A: Harsh rule by military rulers

B: Difficulty controlling and developing natural resources

C: Recent colonization by European nations

D: Extreme gaps between rich and poor

I would say C

Explanation:

I don't know what region you are talking about, but I do believe that European nations have not taken over any region recently.

Unless you mean relative to your time period which would probably be A since they have been mining diamonds since 1700s.

isaac newton first proposed that earth was not perfectly round. instead, he suggested it was an oblate spheroid—a sphere that is squashed at its poles and swollen at the equator.

the idea of the earth being a flat disc is also inconsistent with the fact that a given lunar eclipse is only visible from half of the earth at a time. the only shape that casts a round shadow no matter which direction it is pointed is a sphere, and the ancient greeks deduced that this must mean the earth is spherical.