The incas used the chasqui runners for relaying messages throughout the empire and llamas and alpacas for transporting goods. The chasqi were known as the runners of the empire.
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The rise of the Bolsheviks in Imperial Russia.
In case of England, the system of mercantilism was never inconsistently enforced. The correct option among all the options that are given in the question is the third option or option "C". England used the mercantilism system in case of its colonies very well. This system was created in favor of the mother nation.
D) Eradicating polio
The United Nations efforts to eradicated polio have been extremely effective, and very little occurrence of polio still exists across the globe. According to information provided by the UN on World Polio Day in October, 2017, only 3 countries in the world (Afghanistan, Nigeria, Pakistan) still had any occurrence of the disease. At that point in 2017, only 12 cases of polio had been reported worldwide in that year, and over 400 million children around the world had received polio vaccinations in the past year.