Final answer:
Nitrogen in Earth's atmosphere is essential for synthesizing proteins, a fundamental process for living things.
Explanation:
Nitrogen is the gas in Earth's atmosphere that helps living things make proteins. Nitrogen is essential for the production of amino acids, proteins, and nucleic acids, all crucial components for life processes.
Oxygen and carbon dioxide, although important for different biological functions, do not play a direct role in the synthesis of proteins like nitrogen does.
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