Which Stage Did Anaerobes First Appear?

They made their appearance 3 billion years ago in the waters of the first oceans. At first, there were only anaerobic heterotrophic bacteria (the primordial atmosphere was virtually oxygen-free). The first autotrophic bacteria, very similar to the current cyanobacteria, appeared approximately 2 billion years ago.

Was the first cell anaerobic?

The first beings were probably much like coacervates. As a group, these bacteria are called heterotrophic anaerobes (ann-air-robes). Because there was virtually no oxygen in the atmosphere at this time, these bacteria were necessarily anaerobic, meaning they did not breathe oxygen.

Which came first on the planet aerobic or anaerobic?

Explanation: It is because in primitive earth , there was lack of oxygen as only the four were mainly present that include hydrogen , ammonia ,metane and water vapours . Also oxygen was only present in form of water molecule at that time . Thus we can say the first life on earth was anaerobic.