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Why are fuels useful?(please explain in detail)

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TRACE fossils provide us with indirect EVIDENCE of life in the past, such as the footprints, tracks, burrows, BORINGS, and feces left behind by animals, rather than the preserved remains of the body of the actual animal itself. ... These imprints give scientists clues as to how these animals livedFossils document the existence of now-extinct species, showing that DIFFERENT organisms have lived on Earth during different periods of the planet's history. They can also help scientists reconstruct the evolutionary histories of present-day species



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