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Practice Speaking: Read Aloud
ID: #51532
Long Archean Eon
During Archean Eon, methane droplets in the air shrouded the young Earth in global haze. There was no oxygen gas on Earth. Oxygen was only in compounds such as water. Complex chemical reactions in young oceans transformed carbon-containing molecules into simple, living cells that did not need oxygen to live. Instead they made energy out of sulfur and elements.
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