1. To understand how carbon is constantly cycled around

4. True or false?

5. True

6. False – combustion releases carbon dioxide gas

7. False – more is found in marine organisms and limestone rock deposits

8. True

9. False – both animals and plants respire

10. False – they respire and release carbon dioxide

11. True

12. False – scientists think it will cause global warming

13. True

14. True