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
What More Do I Need? What More Do I Need? "What More Do I Need?" is the 94th episode of the ABC television series, "Desperate Housewives". It is the seventh episode of the show's fifth season and aired on November 9, 2008. The story continues from the previous episode, when Lynette confronted Tom after she thought he is having an affair. They both misunderstood each other, but the situation is immediately resolved when Lynette realizes that Porter is the one who is having sex with Anne. Lynette and Tom ask Porter to end the relationship via the phone, but Porter refuses, fearing that Mr. Schilling