The Nitrogen Cycle
Meta Description Understand the nitrogen cycle in simple language with clear steps and examples. Ideal for IGCSE/ Cambridge Biology students and exam revision. Why Nitrogen Matters in Living Things Nitrogen is one of the most important elements for life. It helps build proteins, enzymes, and DNA , which every living organism needs to grow and function. Even though about 78% of the air is nitrogen gas , most plants and animals cannot use it in this form. That’s where the nitrogen cycle comes in. The nitrogen cycle is nature’s way of recycling nitrogen so that it can move from the air into the soil, into plants and animals, and back again. What Is the Nitrogen Cycle? The nitrogen cycle is the continuous process that changes nitrogen into different forms and moves it through the environment. It connects: The atmosphere Soil Plants Animals Microorganisms Without this cycle, plants wouldn’t get the nutrients they need, and food chains would break down. Simple Diagram of the Nitrogen C...