The human population has experienced unchecked growth
for the past 200 years. What does "unchecked" mean?

As water is cooled from 4 c to 0 c its density

All of the following occurred due to the invention of the railroad except

Why are young eastern european democracies at an increased risk for turmoil during a global recession? a) anger against increased democracy b) failure of the free market system c) government corruption d) lack of from the e.u.