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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Tú _tomas ________ (tomar) muy buenas notas.
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Yo llegué a un lugar nuevo cuando fui de vacaciones el año pasado.
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Buscan al profesor de ingles / They are looking for the english teacher
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