I believe the answer is: concept of <span>conservation
concept of conservation refers to the understanding that something would stay in the same quantity even though it is moved to different medium/appearances.
On average, understanding of </span>concept of conservation would not be developed before we enter the age of 7.
C? i'm not sure. Hope this helps though
People living in the 21st century have a better life quality than people who lived in previous times. The statement comes with two different views, reasons for which can be stated. Though most of us can agree with the statement.
The 21st century can be a great time to live in because of the great advancements in science and technology which have paved new ways for people as well as for the world at large, to come up with new and innovative discoveries as well as inventions. This could eventually reduce the number of problems people may have been facing earlier.
The statement can be disagreed with as well because with the advancements coming up, the quality of life is decreasing since man is becoming more and more dependent on technology. Moreover, the environment too is being impacted to a great extent.
To learn more about 21st century, click
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They learn to not just fool around and to start working because if they didn't start working then the next hole town would callapsed.