Question

Which element is used in the synthesis of proteins?
a. Hydrogen, b. Nitrogen,
c. Oxygen, d. Carbon dioxide.

Answer 1

Hello there 
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 QUESTION - Which element is used in the synthesis of proteins?
ANswer        - Nitrogen 
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Answer 2

 b. Nitrogen
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Nitrogen is used in the synthesis of proteins

Nitrogen is very essential for plants to synthesize  proteins and some plants eat insects to get their required amount of nitrogen