They give us informations about our ancestors and how did they live and what did they do and than compare it to present way's of life.
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Scientists agree that global warming is caused mainly by human activity. Specifically, the evidence shows that certain heat-trapping gases, such as carbon dioxide, are warming the world—and that we release those gases when we burn fossil fuels like coal, oil, and gas..
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Important lines of latitude<span> include the Tropic of Cancer I think </span>