What is population?
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How does biological diversity relate to the characteristics of the abiotic factors of an ecosystem?
What is the primary energy source for life on earth?
What is protocooperation?
What is the cost-benefit relation regarding sewage treatment as a strategy to fight water pollution?
Define a food chain?
What is selective waste collection?
Define eutrophication?
Explain the typical conformation of the age pyramids of underdeveloped countries?
Define protocooperation?
How are grasslands classified?
What are primary consumers?
Explain global warming?