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That is not completely true, virtually all the oxygen on Earth came from bacteria. Life interacts with physics.

• f055 12y ago
  Life IS physics.
• pyre 12y ago
  The bacteria weren't attempting to seed life or "heal" the Earth by producing oxygen. It was a by-product, that by coincidence other organisms were able to develop to use.
  • nashashmi 12y ago
    Enough with the "heal" already. I was being metaphorical.