Explain what is the most abundant form under which nitrogen is found in nature?
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What are the typical vegetation and the typical fauna of the tundras?
What is selective waste collection?
What is commensalism?
What is the cost-benefit relation regarding sewage treatment as a strategy to fight water pollution?
What are the main interspecific ecological interactions?
Explain why transgenics are considered a threat to the environmental safety?
Explain environmental resistance?
Define a food chain?
Explain the parasitism?
Explain the typical conformation of the age pyramids of underdeveloped countries?
What is the water cycle?
What do numeric pyramids represent?