# Explain how carbon from carbon dioxide in the atmosphere is transferred into the bodies of animals, and how it is returned to the atmosphere through two different processes.

> Edexcel GCSE Biology (1BI0) — 9.3 Material cycles · Explain · 4 marks

## Mark scheme (4 marks)

1. Plants absorb carbon dioxide from the atmosphere during photosynthesis
2. Animals obtain carbon by eating (consuming) plants or other animals / carbon passes along a food chain
3. Carbon is returned to the atmosphere as carbon dioxide by respiration (in plants, animals or decomposers)
4. Carbon is returned to the atmosphere as carbon dioxide by combustion of organic material / fossil fuels / biomass

## Related

- [Revision notes for Edexcel GCSE Biology (1BI0)](https://www.gradenine.co.uk/learn)
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