asked 69.9k views
0 votes
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

1 Answer

3 votes
im not 100% sure but my best guess would be , b. returned to the soil by rhizobnium
answered
User Macucula
by
8.1k points
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