Why is the sun the “motor” of the water cycle?
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What is the most abundant form of nitrogen in nature?
What is protocooperation?
Define the nitrogen cycle?
What are biogeochemical cycles?
Define environmental resistance?
Explain what are the main limiting factors for the growth of a population?
What are biotic factors?
Explain how does biological diversity relate to the characteristics of the abiotic factors of an ecosystem?
What are the main sources of mercury pollution?
What is the difference between the concepts of food chain and food web?
Explain how does the vegetal stratification of an ecosystem influence the biological diversity?
Explain some examples of interspecif competition?