Question

which of these elements is needed in addition to carbon, hydrogen and oxygen (1)- nitrogen,l (2)- phosphorus (3)- potassium (4)- calcium​

Answer 1

Answer:

Oxygen

Explanation:

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Answer 2

HEY A.R.M.Y!

Here is your answer:

Nitrogen is the element that is needed in addition to carbon, hydrogen and oxygen.

Explaination:

Proteins are composed of molecules called amino acids, and each amino acid contains four elements: hydrogen, oxygen, nitrogen and carbon.

So, the answer to the question is (i) Nitrogen.

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