The Nitrogen Cycle
Nitrogen is integral to the production of protein and DNA. Discover how it is present on Earth in a constant cycle, and how nitrogen from the air enters the food chain. Biology - Ecosystems - Learning Points. The nitrogen cycle describes the path of nitrogen through nature. Nitrogen is essential for life, and it is found in amino acids, proteins and DNA. Nitrogen is the most abundant element in the atmosphere. Nitrogen gas must be "fixed" so it can be used by living organisms. A Twig Curriculum Film. Delivering key learning points. Get straight to the facts in just three minutes – directly linked to core learning, Twig's curriculum films will fit neatly into your lesson plans.
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