The correct answers are - Rapid burial, Absence or limited oxygen supply and undistrubed by geological forces
Rapid burial process preserves the fossils of the dead organisms as soon as they are buried after death. In case if they are not buried rapidly, the disturbances in the terrestrial ecosystem alters their uniformity such as the disturbances produced by the decomposers, scavengers, sun. wind etc. Also these fossils remain intact if they are not disturbed after burying thus"undisturbed by geological forces" is a supporting factor in fossilization process. Impact of heat and pressure disturbs the process of fossilization thus no fossils are found in metamorphic rocks. As fossilization occurs deep with in the earth surface, absence of oxygen proves to be a supporting factor in the fossilization process.
