• Phosphorus is used primarily in ATP production
• The main source for phosphorus occurs from mineral ions
• Phosphorus exists primarily as PO43- ions in the form of sedimentary rock deposits
• Dissolved rocks allow the phosphorus to be released for absorption by plants
• Animals get their phosphorus from consuming the plant
• Excess phosphate ions are excreted by animals and may accumulate in waster material
• Dead plants and animals are decomposed using bacteria/fungi which releases the phosphate back into the soil/water
o Phosphate remains in bones and therefore is trapped
• Phosphate ions in excreta released by decomposition and dissolved out of rocks are transported by streams and rivers into lakes and oceans where they form sedimentary rocks