When Did the First Prokaryotic Cells Appear

The first fossils of prokaryotic (bacterial) cells are known from 3.5 and 3.4 billion years ago.

When did the first eukaryote cells appear?

The eukaryotes developed at least 2.7 billion years ago, following some 1 to 1.5 billion years of prokaryotic evolution.

When did prokaryotic and eukaryotic cells appear?

Fossil records indicate that eukaryotes evolved from prokaryotes somewhere between 1.5 to 2 billion years ago. Two proposed pathways describe the invasion of prokaryote cells by two smaller prokaryote cells.