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.
Scientists do not know exactly how much oxygen comes from the ocean and how much comes from the trees on land. Some scientists believe that more than one-half of the oxygen comes from the ocean while other scientists say only about one-third of the oxygen comes from the ocean.