How does gpp relate to photosynthesis?
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What is an ecosystem?
What is selective waste collection?
What is population growth rate?
What is the nitrogen cycle?
What is a population?
What is population density?
Is pollution always caused by humans?
What are the advantages of leguminous crop rotation in agriculture?
What is the typical fauna of the tropical forests?
How many tropic levels can a food chain have?
What are heterotrophic beings?
Can a tertiary consumer of one chain be a primary or secondary consumer of another chain?