@slidesworldwide: Billions of years ago, oxygen wasn’t essential for life — it was toxic. When early organisms began producing it, it completely changed Earth’s atmosphere and wiped out much of the existing life. But that same change also made complex life possible… including us. So the air you breathe today was once deadly. Follow for more🌎 #slidesworldwide #evolution #oxygen #HistoryTime #DidYouKnow

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Wednesday 15 April 2026 08:05:04 GMT