Photosynthesis is the process used by plants, algae and certain bacteria to harness energy from sunlight into chemical energy.
There are two types of photosynthetic processes: oxygenic
photosynthesis and anoxygenic photosynthesis. Oxygenic photosynthesis is
the most common and is seen in plants, algae and cyanobacteria.
During oxygenic photosynthesis, light energy transfers electrons from water (H2O) to carbon dioxide (CO2), which produces carbohydrates. In this transfer, the CO2 is
"reduced," or receives electrons, and the water becomes "oxidized," or
loses electrons. Ultimately, oxygen is produced along with