CYCLING OF MATERIAL S IN THE ECOSYSTEM

• Oxygen-Carbon Dioxide Cycle


  1. Plants use carbon dioxide and produce oxygen

  2. Animals use oxygen in respiration and produce carbon dioxide

  3. Plants use carbon dioxide in photosynthesis
• Nitrogen Cycle


  1. Nitrogen gas turns into compounds in the soil

  2. Nitrogen compounds are later released back into the air
• Nitrogen-fixing bacteria


  Turns nitrogen gas into ammonia
• Nitrogen-fixing bacteria


  Can convert nitrogen gas into nitrates