@WFS,World Fossil Society,Riffin T Sajeev,Russel T Sajeev  1.1-billion-year-old porphyrins establish a marine ecosystem dominated by bacterial primary producers.  N. Gueneli, A. M. McKenna, N. Ohkouchi, C. J. Boreham, J. Beghin, E. J. Javaux, and J. J. Brocks.              PNAS, 2018 DOI: 10.1073/pnas.1803866115 The average cell size of marine phytoplankton is critical […]