Explain the primary energy source for life on earth?
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What are biogeochemical cycles?
Define selective waste collection?
Explain how does the vegetal stratification of an ecosystem influence the biological diversity?
How is carbon dioxide made by producers and consumers?
Why is leguminous crop rotation used in agriculture?
What is plutonium reprocessing? Why is it a big environmental issue?
What is harmonious ecological interaction?
What is the most abundant form of nitrogen in nature?
What is predatism?
What is the typical localization of the tropical forests regarding latitude?
Define dry mass?
What are primary consumers?