Planes, cars, horses, any sort of machine and/or creature that can be used to transport goods of over 150 pounds. I would suggest staying away from any steep mountainous areas and loose material grounds such as sand.
What model are you talking about?
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Social Darwinism would mean survival of the fittest society. Pro would be that a society would survive, con would be that a society would not survive.
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Aryans from central Asia invaded South Asia and introduced the caste system as a means of controlling the local populations.
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In the study of history as an academic discipline, a primary source is an artifact, document, diary, manuscript, autobiography, recording, or any other source of information that was created at the time under study. It serves as an original source of information about the topic.
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hope this helps