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It is estimated that about 50% of the world's oxygen is produced via phytoplankton photosynthesis. The rest is produced via photosynthesis on land by plants. Furthermore, phytoplankton photosynthesis has controlled the atmospheric CO 2 / O 2 balance since the early Precambrian Eon.
Plankton size is usually measured in microns. 1,000 microns (m) equals 1 mm or 0.03937 inch. It is estimated by some, that over 90% of the world's oxygen is produced by four groups of marine phytoplankton, which are the basic food supply for larger plankton and some larger animals.