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
Blended Family (What You Do for Love) 11, 2016, and features both Keys and ASAP Rocky. In September 2017 it was revealed on IMDB that the video was directed by Hype Williams. Blended Family (What You Do for Love) "Blended Family (What You Do for Love)" is a song by American recording artist Alicia Keys, featuring vocals from rapper ASAP Rocky. It was written by Keys, Rocky, John Bush, Brandon Aly, Tish Hyman, Dave Kuncio, Kenneth Withrow and Edie Brickell for her sixth studio album "Here" (2016), while production was helmed by Keys and Mark Batson. The song refers to the former marriage of Keys' husband Swizz