Where does the phosphorus cycle begin

The phosphorus cycle starts in the earth's crust. The phosphate salts are broken down from the rocks. These salts are washed away into the ground where they mix in the soil.

the first step of the phosphorus cycle involves the extraction of phosphorus from the rocks by weathering.

Explanation:

Weather events, such as rain and other sources of erosion, result in phosphorus being washed into the soil.

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it would be c. xylem.