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.
- 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.