http://www.plantphysiol.org... Marais 2000 Marais 2000 ref Marais 2000 http://www.plantphysiol.org/content/154/2/434.full http://www.plantphysiol.org/content/154/2/434.full Early evolution of photosynthesis. Early evolution of photosynthesis. Early evolution of photosynthesis. Marais 2000 Marais 2000 http://www.plantphysiol.org/content/154/2/434.full photosynthesis Marais 2000 http://www.plantphysiol.org/content/154/2/434.full http://www.plantphysiol.org/content/154/2/434.full Marais 2000 Early Evolution of Photosynthesis 3.4 billion years ago Early evolution of photosynthesis Marais 2000 Marais 2000 Early evolution of photosynthesis. Marais 2000 http://www.plantphysiol.org/content/154/2/434.full Early evolution of photosynthesis. Marais 2000 http://www.plantphysiol.org/content/154/2/434.full