I would have to go with Europe.
Heat- the total energy of all the molecular motion inside a particular object.
Temperature- the average heat of the molecules inside a particular substance.
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Answer:
Virus's,
there would be stealing too
Explanation: The silk road was one of the largest roads built for trading across countries and as they traded the virus's were spreading there was also I really bad type of virus's but I forgot the name. I think you should research about it to get more points and i think this is history related not geography. Enjoy.
The number of people per square mile is the population density
