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:
Cinco de la mañana
Explanation:
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Please give me Brainliest
The correct answer is A - El libro esta debajo del escritorio. Debajo means below/under
