+Phytoplankton are microscopic organisms, primarily algae, that drift through the sunlit surface waters of oceans and lakes. Like the planet's tiny green lungs, they perform [Photosynthesis](/wiki/photosynthesis), creating much of Earth's oxygen and forming the fundamental base of the global [Food Web](/wiki/food_web).
+## See also
+- [Algae](/wiki/algae)
+- [Ocean](/wiki/ocean)
+- [Ecosystem](/wiki/ecosystem)
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