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 Would You Do? (City High song) from that included on the "Life" soundtrack as it features a sample of Dr. Dre's hit song, "The Next Episode". The song, along with the accompanying music video, is a motivational anthem for single parents dealing with poverty and especially acknowledging all the single mothers who feel forced into prostitution due to the need to support their children. It encourages them to keep strong, and keep going on for the sake of their loved ones, and passes no judgement on their profession. What Would You Do? (City High song) "What Would You Do?" is a song recorded by American R&B/hip