IGCSE O Level Biology Online Tests
Carbon Cycle and Fossil Fuels MCQ (Multiple Choice Questions) PDF Download
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Carbon Cycle and Fossil Fuels MCQs: Questions and Answers PDF Download
In carbon cycle, the flow of energy is
- linear
- cyclical
- reversible
- irreversible
Coal, natural gas and oil are forms of
- fossil fuels only
- carbon compounds only
- nitrogen compounds
- fossil fuels and carbon compounds
During respiration, the carbon dioxide (CO2) is
- produced
- released in the environment
- absorbed
- depleted
IGCSE O Level Biology Practice Tests
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