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Fossils can present clues to how vegetation and animals lived in the past – what they seemed like, what they ate, what environments they lived in, and how they advanced and went extinct. For lots of of hundreds of thousands of years, the remains of organisms (as well as tracks, trails, and burrows – known as hint fossils) were nearly all of the clues left behind in Earth’s fossil document. A fossil may be studied to discover out what type of organism it represents, how the organism lived, and the means it was preserved.