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Assessment
What is the primary role of carbon in ecosystems?
Building blocks of life forms
Regulating temperature
Absorbing solar energy
Providing water to organisms
How does carbon enter ecosystems?
Through the decomposition of organic matter
Only from the atmosphere
Directly from minerals in the soil
Only through plant respiration
Which of the following processes is critical for converting atmospheric carbon dioxide into organic material?
Photosynthesis
Respiration
Nitrogen fixation
Decomposition
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