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.
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The way scarce resources get distributed within an economy determines the type of economic system. There are four different types of economies; traditional economy, market economy, command economy and mixed economy. Each type of economy has it’s own strengths and weaknesses.
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the process by which businesses or other organizations develop international influence or start operating on an international scale.
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Answer: front and back region
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When we are dealing with our employer or other professional businesses we have to act different than we normal act , we bring up a different self so we put in a front region.
We have to be this person who is strict , calm , professional at all times when we are dealing with our professional team.
We change the language we speak , the pictures we post on our social network ; everything has to show moral and good ethics because we don't want to risk creating an unprofessional image to our employer or business partners .
However with friends and family we can be as casual as we want to be even the langauge we use , the photos we post on our social network , we can be our normal self without any fear hence we can be in our back region.
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Domesticated animals made the hard, physical labor of farming possible while their milk and meat added variety to the human diet. They also carried infectious diseases: smallpox, influenza, and the measles all spread from domesticated animals to humans. The first farm animals also included sheep and cattle.
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