IGCSE Biology / Ecosystems

The carbon cycle

Edexcel International GCSE Biology (4BI1), chapter 14: Ecosystems, specification point 4.10. Part of the full course.

Read the revision notes · IGCSE Biology past papers

The carbon cycle shows how carbon moves between the atmosphere and living things, dead material and fossil fuels. It matters because burning fossil fuels returns carbon dioxide to the air much faster than it was removed.

More lessons in Ecosystems

• Habitat, population, community, ecosystem
• Practical: quadrats and transects
• What biodiversity means and how it is measured
• Food chains and food webs
• Decomposers and decay
• Pyramids of number, biomass and energy
• Why energy is lost between levels
• The nitrogen cycle