The Two explanations for why a species might disappear from the fossil record are:
1. Not all species are fossilized, the process is rather rare.
2. Fossils decay over time when exposed.
Microfossils are seen in gravels and deposits as the tiny remains of what were once life forms.
For example as flora, fauna, and microbacteria. Marine microfossils seen in aquatic sediments are the most typical microfossils.
Thus, the above explanation, might disappear from the fossil record.
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