The oldest fossils look as though they were formed by organisms that resemble modern

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The oldest fossils, dating back 3.5 billion years ago, were formed by single-celled organisms resembling modern prokaryotes, specifically bacteria. These organisms were simple and lacked a nucleus and other membrane-bound organelles. Fossil evidence of more complex organisms, such as sponges and jellyfish, do not appear until much later in the fossil record. Red algae and amoebas also have a more recent appearance in the fossil record compared to prokaryotes.

The Oldest Fossils Look as Though They Were Formed by Organisms