How are original material fossils formed?

        I don't exactly know but this is what I could find,              

"Replacement is similar, in that minerals seep into the organism. However, the minerals replace the original organic material, as the organic material rots away. In the end, the organism is replaced by minerals. " Many fossils are preserved these ways, from Fossil Sharks Teeth, to Trilobites, to Bone.

Explanation:

videntify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.identify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.