what effect did they have on marine life
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This is generally true of those civilizations that did not build large cities or have powerful tools.
The only suspected major environmental effects of folks such as these was on land, where they are suspected as causes of the extinction of large mammals and of changing the vegetation of the plains area by large scale fires.
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M$You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
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