The first life form to appear on earth were most likely by simple single-celled organisms.
The first eukaryotic cell came into existence about 1.5 billion years ago.
Earlier, the atmospheric conditions were reducing, no oxygen was present. Later, evolution goes gradually and makes the existence of anaerobic photoautotrophs, and the first life forms appeared.
Therefore, the first life form to appear on earth were most likely by simple single-celled organisms.
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