Phosphorus is:
O added to the soll through weathering
O usually very abundant in an ecosystem
Oreturned to the soll by rhizobium
O found free In the atmosphere



Answer :

Final answer:

Phosphorus exists as the phosphate ion in nature, entering soil and water through weathering, supporting terrestrial and marine food webs.


Explanation:

Phosphorus exists in nature as the phosphate ion (PO43-). It is released into the soil and water through weathering of rocks and volcanic activity, contributing to terrestrial and marine food webs. Some of the phosphate from these food webs dissolves in water bodies, while some returns to land through sedimentation.


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