Absorbing/Using Phosphorous
After rocks containing phosphates go through the process of erosion and weathering, plants are able to absorb phosphates through the soil. At this point, phosphates are introduced to the food chain. Animals eat the plants and has phosphorous enter their bodies. Phosphates can be used by the plants and animals to help create sugars and starches, which can be used as energy in the form of ATP. Within plants, phosphorous also helps with the growth of roots and the blooming of flowers. In animals, phosphorous helps to strengthen bones and teeth. It is also essential in cell membranes, as it allows for the synthesization of proteins and phospholipids.
Decomposition
When plants or animals die, they become broken down by decomposers. The decomposers break down the remains and returns it (including phosphorous) back into the soil, which may be used by plants again, repeating the entire cycle.