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The history of life on Earth is largely microbial. “You can certainly run a world without dinosaurs and humans, but you can’t do it without microbes.’ says Harvard Fisher Professor of Natural History and Professor of Earth and Planetary Sciences, Andrew H. Knoll. “For vast stretches of time, bacteria and other single-celled organisms were the only life on Earth. The age of the dinosaurs to the present day,” Knoll said, represents roughly 5 percent of the history of life.” “When we think about the history of life, we tend to think about dinosaurs or, if you’re really informed, trilobites. That’s just the tip of the iceberg,” Knoll said. “Not only were microbes the first living things on Earth, they were critical to the Earth’s transformation. The rise of photosynthetic bacteria called cyanobacteria was a crucial step because these bacteria ingested carbon dioxide and released oxygen.” ....