Answer:
How do fossils provide evidence for change over time? As the world changes, plants and animals change with it. Aside from a few living fossils, the species we see today are very different from species that lived in the past. Thus, the fossil record can be used to show that organisms changed to meet new conditions.
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Answer:
Over time sediment builds over the top and hardens into rock. As the encased bones decay, minerals seep in replacing the organic material cell by cell in a process called "petrification." Alternatively the bones may completely decay leaving a cast of the organism .And also the organism's tissues undergo a chemical reaction with the surrounding material. Minerals that give the fossil a stone-like quality replace the tissue. Rarely, soft tissue is fossilized.
