Biology

The correct answer is "Atmospheric phosphate".

Phosphorus does not have a significant atmospheric component in its cycle, unlike elements such as carbon or nitrogen. Phosphorus primarily moves through the environment in the form of phosphate (PO₄³⁻), which is found in soil, water, and sedimentary rocks. It is absorbed by plants from the soil, incorporated into living organisms, and eventually returned to the soil or water through decomposition or excretion.

Key steps in the phosphorus cycle include:

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