The correct answer would be, No, very little work on outside world.
Very little work on outside world when you rub your hands together to warm them.
Explanation:
When you rub your hands together to warm them up, a friction is created which helps in generating heat within the hands, and in this way the hands are kept warm.
When you rub your hands, the heath goes and disappears within your body, and a very little part of the heat goes into the environment. So this rubbing has a little work on outside world.
As far as the efficiency of this process is concerned, It is very high, as the heat generates and remains within the human body after rubbing and a very little goes on outside world.
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20: checks and balances!
21: Duties: execute law, enforce law, make laws. who does them? EXECUTIVE branch EXECUTEs laws, LEGISLATIVE branch makes laws, and JUDICIAL branch ENFORCES the laws. making sure they are constitutional.
"<em>Brown v. Board of Education</em>reversed the court ruling of <em>Plessey v. Ferguson."</em>