At first glance a fossil might look like a Common bone. In fact, it is the result of a chemical transformation-fossilization-that takes place before the Remains of dead animals can decompose. One common form of fossilization is mineralization. In this process the original organic material is replaced, either totally or partially, by minerals present in wet sedimentary deposits. Thus, for fossilization to occur, specific environmental conditions are necessary. They include an abundant deposit of sediment and rapid burial of the remains, as well as their resistance to disintegration. Under normal circumstances, animal remains that are left uneaten are finished off by bacteria as well mechanical and chemical agents, such as wind and water. Fossilazation, therefore, is very rare. What do you think?