Important of Nitrogen cycle.

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The nitrogen cycle is crucial for life on Earth because nitrogen is a fundamental component of amino acids and nucleic acids (DNA and RNA). Plants and animals cannot directly use the abundant nitrogen gas (N₂) in the atmosphere. The nitrogen cycle converts atmospheric nitrogen into usable forms, such as ammonia (NH₃) and nitrates (NO₃⁻), through processes like nitrogen fixation. This allows plants to absorb nitrogen, which then moves up the food chain when animals consume plants. Without the nitrogen cycle, essential biological molecules could not be synthesized, severely limiting or preventing life as we know it.