I have completed the problem
C. Is your answer hope you have a wonderful day
Answer:
The answer to your question is: Nitrogen
Explanation:
Organic molecules that are part of living organisms are composed by
Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorus and Sulphur.
The elements available in more quantity are Carbon, Hydrogen and Oxygen.
Nitrogen is present in proteins and nucleic acids.
Answer : The solubility of
in water is, 
Explanation :
The solubility equilibrium reaction will be:

Let the molar solubility be 's'.
The expression for solubility constant for this reaction will be,
![K_{sp}=[Ag^{+}]^3[PO_4^{3-}]](https://tex.z-dn.net/?f=K_%7Bsp%7D%3D%5BAg%5E%7B%2B%7D%5D%5E3%5BPO_4%5E%7B3-%7D%5D)


Given:
= 
Now put all the given values in the above expression, we get:



Therefore, the solubility of
in water is, 