Earth can be considered as a closed system, since it only receives sunlight (energy), while the overall mass stays constant, without (almost) any exchange from space. Another example of a closed system is a saucepan or frying pan, on a stove, when its lid is closed.
Because it was one of China's wonderful eras.
This is the hierarcy of a combination of concepts: social status, economics, privilege, and being a minority or majority. Politics is the science of how human social status and the degree of wealth a person has can affect the life they live. Politicians are meant to represent the people. They are citizens just like us with different family backgrounds but they have the privilege of being leaders. This means they often decide who gets what when and how.
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<em>I think it might be D.concurrent Because two concurrent courts of law.</em>
<em>accordant or agreeing: concurrent testimony by three witnesses.</em>
<u>Problem of classical economics pointed by John Maynard keynes:</u>
He was complaining about economists who believed that unemployment would be reduced or eliminated after the recession if the market is not somehow stimulated or steered in right direction. He agreed that this strategy can work in long run, however, in short run, it would pose some problems due to people’s nature of hoarding money and banking preferences.
The classical economists believed that in the midst of a great depression and recession, the government should not do much and the economy would recover on its own which may take decades for such to happen.