1.1-billion-year-old porphyrins establish a marine ecosystem dominated by bacterial primary producers [Earth, Atmospheric, and Planetary Sciences]

The average cell size of marine phytoplankton is critical for the flow of energy and nutrients from the base of the food web to higher trophic levels. Thus, the evolutionary succession of primary producers through Earth's history is important for our understanding of the radiation of modern protists ∼800 million...

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