TERRESTRIAL FOSSILS WERE LIVING ORGANISMS LIKE ANIMALS, PLANTS, BACTERIA OR FUNGI THAT EXISTED ON LAND AND UNDERWENT A FOSSILIZATION PROCESS AFTER THEY PASSED AWAY. ALSO FOOTPRINTS OR BURROWS ARE FOSSILS EXIST THAT ARE CALLED TRACE FOSSILS.
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THE FOSSILIZATION PROCESS ONLY HAPPENS IF THE CONDITIONS AND THE ENVIRONMENT ARE IDEAL TO PRESERVE THE BODY. A LOT OF ASPECTS DEPENDED ON THE SOIL OR LAYER THAT COVERED THE BODY, TEMPERATURE... MOSTLY THE TOUGHEST PARTS OF A LIVING ORGANISM WILL TURN INTO A FOSSIL, LIKE BONES OR PLANTS. BUT SOMETIMES ALSO SOFT-BODIES ARE ABLE TO BE PRESERVED AS A FOSSIL. 
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A SHORT SUMMARY OF A FOSSIL:
ORGANISM PASSES AWAY - BEING BURIED IN SOFT SEDIMENT DEPRIVED OF OXYGEN - OVER TIME THE ORGANIC MATERIAL GETS REPLACED BY VARYING MINERAL COMPOSITIONS BUT RETAINING THE STRUCTURE AND OVERALL SHAPE - THE SOIL SURROUNDING THE FOSSIL ERODES AWAY OR GETS REMOVED BY PALEONTOLOGISTS EXPOSING THE FOSSIL FOR EXTRACTION.

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