Answer: External forces are forces caused by external agent outside of the system. Internal forces are forces exchanged by the objects in the system. To determine what part should be considered external and internal, mechanical system should be clearly defined.
Explanation:
The roots of the human civilizations are mostly associated with the Asian continent because most of the early civilizations developed here, like the Sumerians, Persians, Phoenicians, Babylonians, Chinese, Hindus. These civilizations, especially the ones from the southwestern part of Asia, played a key role in the development of the civilizations along the Mediterranean in Europe, since they were borrowing culture, alphabet, math, lots of inventions, mythology etc. After their cultural traits were accepted in Europe, they started to spread around even more, and gave the basis for the development of lots of other civilizations.
C. on reserves
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