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 Won't Do for Love (song) What You Won't Do for Love (song) "What You Won't Do for Love" is a blue-eyed soul-styled single recorded by Bobby Caldwell for his eponymous debut album (1978). It was written by Caldwell and Alfons Kettner and released in by Clouds Records domestically and by TK Records internationally. After gaining a reputation in Miami clubs as a talented musician, Caldwell was signed to an exclusive contract with TK Records in 1978 by TK Records president Henry Stone. Heading to the studio, Caldwell recorded his first album, which was given a redo after Stone felt the album was good but "didn't