Pyruvate is an intermediate in many metabolic pathways, but the vast majority is converted to acetyl-CoA as a result of cardio (with oxygen) glycolysis and fed into the citric acid cycle. In vegetation, cyanobacteria and algae, oxygenic photosynthesis splits h2o, with oxygen manufactured as a squander item. Three styles of photosynthesis come about in plants, C3 carbon fixation, C4 carbon fixation and CAM photosynthesis.