During the 20th century what was a common source of phosphorus

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Ibelieve the answer is d. titaniumhope my answer has you : )

Putting salt in vinegar water

Atp, shorthand for adenosine triphosphate, is the standard molecule for cellular enger in the human body. all motion and metabolic  processes  within the body begins with energy that is released from  atp, as its phosphate bonds are broken in cells through a  process  called hydrolysis.