Define a population?
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What is the role of the ozone layer for the living beings?
Define eutrophication?
What is biologic control?
Define an ecosystem?
What do you mean by eutrophication?
Explain what are the main limiting factors for the growth of a population?
How is carbon dioxide made by producers and consumers?
Define a food chain?
Explain how are grasslands classified?
What are the typical vegetation and the typical fauna of the tropical forests?
Explain the typical conformation of the age pyramids of underdeveloped countries?
Define parasitism?