B)Himalayan
Because due to tectonic plates, the subcontinent of India pushed into Asia created the Himalayan.
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The Pax Romana was established under the government of Augustus, with a strong military outfit that decreed the end of civil wars, establishing a peaceful environment due to the forces of the arms. There was also a fear of barbaric attacks, which diminished the popular internal uprisings.
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Advantages: changed the way humans lived, allowed humans to form permanent settlements via agriculture, formed social classes, advances in technology
disadvantages: people had poorer nutrition and lower life expectancies, lifestyles were more labor intensive
B) There were more animals capable of being domesticated in America than in Europe, Asia, and Africa?
Because during that time railroad company's would monopolies on farmers and the act required them to have a reasonable and just cost to use railroads. Hope this helps.