Mrs Vargas, please is the answer
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.
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Answer: Yo no se, mis padres se van. Nomas estoy en la casa.
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Answer: is this a question or do you need a translation
