What organisms with hard parts stand a good chance of being fossilized if they are

The living organism that has harder parts has a very good chance of getting fossilized when they are buried by sediments rapidly.  

Explanation:

A Fossil can be explained as the remaining of animals or a plant. Most of the fossils are retained mainly in a rock.  

Through the process of weathering or erosion, the fossils that are present in the rock come to the surface. Fossils can be broken into categories like Bones or shells, Impressions, casts or molds, Black layer of carbon, Nests and  trials or tracks.

a. themes: sub fields

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