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
Get What You Need more innocent, drunken, loutish times with a smile on the faces of everyone in your immediate vicinity" and recommended the album. "Uncut Magazine" gave a favorable review as well, remarking that its songs "inhabit the same ageless corner of garage band heaven as earlier classics". In contrast, "Blender" gave it two stars out of five—'mediocre'—and stated that "they sound more like a road-toughened bar band". Get What You Need Get What You Need is a 2003 studio album by an Irish power pop/punk rock band The Undertones. It is the band's first collection of new studio material since their reformation