Photosynthesis More recent studies, reported in March 2018, also suggest that photosynthesis may have begun about 3.4 billion years ago. The main source of oxygen in the Earth's atmosphere derives from oxygenic photosynthesis, and its first appearance is sometimes referred to as the oxygen catastrophe. Geological evidence suggests that oxygenic photosynthesis, such as that in cyanobacteria, became important during the Paleoproterozoic era around 2 billion years ago. Modern photosynthesis in plants and most photosynthetic prokaryotes is oxygenic. Oxygenic photosynthesis uses water as an electron donor, which is oxidized to molecular oxygen () in the photosynthetic reaction center. Several groups of animals
What Can You Do for Me 10 on 15 September. The song spent a total of 11 weeks inside the top 75 chart. In Australia, "What Can You Do For Me" did not enter the ARIA top 100 singles chart until April 1993, following its re-release after the success of "Something Good". A new version of the song remixed by Drumsound & Bassline Smith was released on 26 February 2012. What Can You Do for Me "What Can You Do For Me" is the debut single by English electronic group Utah Saints. The song was released on 12 August 1991 and reached a peak position of