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.
Inorganic nitrogen sources The air we breathe is about 78% nitrogen in the form of N 2 gas and about 21% oxygen in the form of O 2 gas. The remaining one percent of the atmosphere is a combination of all the other gases, including carbon dioxide that is the source of carbon used by green plants.