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Biology 16 Online
OpenStudy (anonymous):

Phosphorus is: found free in the atmosphere returned to the soil by rhizobium added to the soil through weathering usually very abundant in an ecosystem

OpenStudy (nincompoop):

added to the soil through weather. it cannot exist by itself, as it is very reactive. one can argue that it is also abundant in an ecosystem since it is essential to life. so for every life, there's phosphorus

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