Evolution of photosynthesis 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. Timeline of Photosynthesis on Earth Several groups of animals have formed symbiotic relationships with photosynthetic algae. These are most common in corals, sponges and sea anemones. It is presumed that this is due to the particularly simple body plans and large surface areas of these animals compared to their volumes. In addition, a few marine mollusks "Elysia viridis" and "Elysia chlorotica" also maintain a
Ghetto Day/What I Need "What I Need" and "100% Pure Love", the album's first single, "ooze with giddy abandon—not to mention juicy grooves that seep deeper into the brain and body upon repeated spins." "What I Need" was claimed by "Spin" Bernstein to have "xeroxed" Clivillés and Cole's 1991 single "A Deeper Love". However, he predicted that it could have been a potential successor to her previous signature hits, "Gypsy Woman" and "Makin' Happy". "Ghetto Day" and "What I Need" were released as a double A-side single in June 1994. The joint release peaked at 40 on the UK Singles Chart and at No.