What is the respective importance of nitrogen for the living beings?
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Can food chain present quaternary consumers without having secondary or tertiary consumers?
What are tropic levels?
Define eutrophication?
What are the main types of waste?
What is a community? What is the difference between the concepts of community and population?
What are the main causes of the loss of the biological diversity nowadays?
Why are less biodiverse ecosystems under the risk of suffering deep biological harms if submitted to even small changes?
What are the main characteristics of the age pyramids of developed countries?
What is the cost-benefit relation regarding sewage treatment as a strategy to fight water pollution?
Explain what is an example of intraspecific competition?
Define a biodigester?
What are abiotic factors?