During which geological era did life first appear on the planet?

Name: During which geological era did life first appear on the planet?
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Life first appeared on Earth during the Precambrian era, which lasted from about 4.6 billion years ago to 541 million years ago. This era is divided into three periods: the Hadean, Archean, and Proterozoic. The fossils from the Precambrian are typically simple unicellular organisms, such as bacteria and algae.

During Which Geological Era Did Life First Appear on the Planet