Answer: This is just a guess but maybe like if you have like thermal vision I guess-
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In natural selection, only the fittest organism are able to survive long enough to reproduce. Therefore, only these organisms pass on their genetic information, as they were "selected" by nature.
-The Eastern front was more mobile
-The Western front used more trench warfare
-France and Great Britain were fighting Germany on the Western front
-Russia and Serbia were fighting Austria-Hungary on the Eastern front
-The Western was mainly in France and Eastern in Russia
They wanted to have land that they could farm. The east was already crowded by large farms and cities. They were also in search of gold. There were also many trees that could be cut down and sent east, these people sought out a way to make money, or provide for their families that was not in the congested dirty cities of the east.