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03-03-2021
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¿A qué se debió el incremento en la cantidad de oxígeno en la atmósfera hace miles de millones de años?

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11-03-2021

Scientists think that algae first evolved approximately 2.7 billion years ago, and soon after this oxygen began to exist in the atmosphere. Photosynthesis by primitive plants and algae released oxygen, which gradually built up in the atmosphere.

Explanation:

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