Nitrogen is necessary for building these two organic molecules: O carbohydrates & lipids
carbohydrates & proteins
nucleic acids & lipids
nucleic acids & proteins

D

Explanation:

the major constituents of carbohydrates are carbon, oxygen, and hydrogen while protein contains nitrogen,carbon, hydrogen,and some mineral elements, and lipids major constituents are carbon, hydrogen and little oxygen.

the nucleic acids are packed with histones, which is proteinous, and contain nitrogen too

the atomic number of magnesium is 12. its nucleus must contain 12 protons and no electrons. the atomic number of an atom is determined by the number of protons.

magnesium is an electrolyte injection commonly used to treat low magnesium levels in your blood. it is also used to prevent or control seizures in women with preeclampsia or eclampsia.

ever get the answers? im stuck on this as well