Answer: There was continued diffusion of crops and pathogens throughout the Eastern hemisphere along the trade routes.
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It might be the way they look, they way they talk or the way there home looks.
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B) Business owners used force to protect their workplaces from unionizations.
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becuase they are helpful to all the people they meet
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I think that one of the main ones most of the time is drought as we have such a dry and hot climate. But currently flooding is an issue, in Tasmania we just had the biggest flood since the 1921 floods (Look it up).
Northern parts of Australia are also prone to tropical cyclones