Hourly Forecast Detailed. 1  0am:The Santee, SC forecast for Apr 11 is 63 degrees and Clear. There is 74 percentage chance of rain and 4 mph winds from the South-Southeast. 2  3am:The Santee, SC forecast for Apr 11 is 55 degrees and Clear. There is 79 percentage chance of rain and 4 mph winds from the South.
Most Important Organism? Marine plants produce between 70 and 80 percent of the oxygen in the atmosphere.
Phytoplankton absorb energy from the sun (photosynthesis) and nutrients from the water to produce their own food. An estimated 50 percent to 85 percent of Earthâs oxygen is produced by this type of plankton photosynthesis with the remaining percent produced by land plant photosynthesis.