Phosphorous

 Phosphorous is a very important molecule for both plants and animals. 

Phosphorus is present in bones - bound as insoluble mineral hydoxylpatite. It controls protein activity (especially enzymes) and is a critical component of high energy molecules. It also forms the backbone of DNA and RNA. Almost all organic phosphorus present in biological systems is derived from phosphoric acid & phospate. The key property of ionisation and protonation behaviour makes the phosphate molecules highly soluble and able to react as they form esters.