Answer:
The oldest fossils, between 3.5 and 3.8 billion years old, are then accepted as both the first life and prokaryotic.
The first life form probably has been a prokaryote rather than a eukaryote because earlier the surrounding was reduced, no existence of oxygen, and a huge amount of carbon and other gases was present that favors the prokaryotes.
Prokaryotes may be defined as a type of microscopic single-celled organism that does not possess a distinct nucleus with a membrane and other membrane-bound cell organelles. It includes bacteria, cyanobacteria, etc.
Prokaryotes are the simplest life forms that significantly require carbon. Such prokaryotes originated approximately 3.5 billion years ago.
And that time environmental conditions were reduced, anaerobic, and nutrition is heterochemotrophic. There was a complete absence of the ozone layer, which was not favorable for eukaryotes.
Eukaryotic cells require oxygen, sunlight, protection from ozone, significant temperature, and water for their survival. But all conditions are extremely opposite in ancient times.
Therefore, it is well described above.
To learn more about Prokaryotes, refer to the link:
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