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1 vote
Phosphorous is:

A:found free in the atmosphere

B: returned to the soil by rhizobium

C: added to the soil though weathering

D: usually very abundant in an ecosystem

User Mynd
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2 Answers

2 votes

Answer:

B

Step-by-step explanation:

User Npjohns
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6 votes

Answer: A

Explanation: I used google

User Neelaganda Moorthy
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