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If Cyanobacteria are considered to be the original producers of oxygen (and the start of oxygen gas rising to the atmosphere) wouldn't that prove that for any exoplanet, with an abundance of water / oxygen, must contain life?

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If Cyanobacteria are considered to be the original producers of oxygen (and the start of oxygen gas rising to the atmosphere) wouldn't that prove that for any exoplanet, with an abundance of water / oxygen, must contain life?	1