How does Oxegyein became available in the atmosphere
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Answer:The answer is tiny organisms known as cyanobacteria, or blue-green algae. These microbes conduct photosynthesis: using sunshine, water and carbon dioxide to produce carbohydrates and, yes, oxygen. ... "What it looks like is that oxygen was first produced somewhere around 2.7 billion to 2.8 billon years ago
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Oxygen is replaced in the atmosphere by the plants as they prepare food (photosynthesis). Carbon dioxide is replaced by the animals for the plants to consume. Plants and Animals are interdependent on each other for survival.
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