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The most populated country in the world is "China".
China has an estimated 1.3 billlion people, while India is close behind with 1.2 billlion. The U.S. has an estimated 350 million people. Europe is not a country.
The correct answer is "Mass is a measure of how much matter an object has. Weight is a measure of how strongly gravity pulls on that matter".
Mass is a measure of how much matter an object has, while weight is a measure of the gravitational force pulling on that matter. If you travel to the moon your weight would change because the gravitational force is weaker than on Earth, but your mass would stay the same. Mass never changes.