Microscopic fossils, or Unicellular of single celled prokaryotic organisms that resemble modern bacteria have been found in rocks more than 3.5 billion years old.
Microfossils are seen in gravels and deposits as the tiny remains of what were once life forms for example as flora, fauna, microbacteria Marine microfossils seen in aquatic sediments are the most typical microfossils.
Thus, unicellular is the correct answer.
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