*The ability of cell membranes to allow the passage of specific molecules is primarily due to
in the membrane

The correct answer is weathering.  

The dissociation of soil, rocks, and minerals, as well as wood and artificial components via exposing with the atmosphere of the Earth, biological species, and water, is known as weathering.  

In the phosphorus cycle, the phosphorus moves in a cycle via water, rocks, sediments and soil, and organisms. In this cycle, with time, the process of weathering and rain makes rocks to discharge phosphate ions and other minerals. This inorganic phosphate then gets dispersed in water and soils.