Poisonous gas wave may have snuffed out half of all sea life in Earth's 1st mass extinction

About 510 million years ago, a deadly combination of low oxygen and surging hydrogen sulfide may have been what decimated 45% of all ocean life.

Poisonous gas wave may have snuffed out half of all sea life in Earth's 1st mass extinction
About 510 million years ago, a deadly combination of low oxygen and surging hydrogen sulfide may have been what decimated 45% of all ocean life.

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