When life was new on Earth, it invented photosynthesis. Photosynthesis takes light from the Sun and captures it as useful energy. It also produces waste oxygen.
We like oxygen, because we breathe it, but we forget that chemically, it’s pretty nasty. Oxygen gas is implicated in lots of bad things, from rust to explosions. It’s not stable, and it’s highly chemically reactive. It sits on the periodic table next to fluorine, and if you know anything about fluorine, you know you should stay away from it. And when photosynthesis first evolved, oxygen was deadly to most life on Earth….
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