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 You Need from Me go well together. What You Need from Me "What You Need From Me" is a duet recorded by Welsh singer Bonnie Tyler and American singer-songwriter Vince Gill, taken from Tyler's sixteenth studio album and the 4th track of the album, "Rocks and Honey" (2013). The song was composed by American country singer-songwriters Jon Randall and Jessi Alexander and presented to Bonnie Tyler and her manager when they visited Nashville in 2011 searching for new material from music publishers. After hearing a demo of the song, Tyler said that she would prefer to sing the song as a duet, and approached