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
Liquid Liquid Liquid Liquid Liquid Liquid is an American no wave and dance-punk group, originally active from 1980 to 1983. They are best known for their track "Cavern," which was covered by the Sugar Hill Records house band as the backing track for Melle Mel's old school rap classic "White Lines (Don't Do It)." The group released a series of extended plays, including the acclaimed 1983 12" EP "Optimo". In 2008, the band reformed, playing in various venues around the globe. Liquid Liquid emerged from downtown New York's no wave scene. The group's original records were pressed in very limited quantities on