Life or biological processes occurring in the complete absence of oxygen; anaerobic existence of organisms.
From Greek 'a-' (without) + 'oxys' (oxygen) + 'biosis' (life, living). A biological term combining multiple Greek roots to describe oxygen-free life.
Some bacteria practice anoxybiosis in deep ocean vents and swamps—they've evolved to thrive without any oxygen at all. They're some of the oldest life forms on Earth, predating the Great Oxidation Event!
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