nutrients, cells evolved that were able to make their own energy-rich molecules from inorganic materials. Without the evolution of these autotrophic organisms, life on Earth would have ceased to exist.
These photosynthetic organisms grew in population and changed the face of the entire planet. Because the process of photosynthesis releases oxygen, oxygen began to accumulate in the atmosphere. This was not an overnight change. In fact, it took millions of years, and by 700 million years ago, atmospheric…
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