What is the phytoplankton?
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What are the analyses provided by the study of human age pyramids?
What are biomass pyramids? What do they represent?
What is the formula of the net primary production?
Define a biodigester?
Why is it a big environmental issue?
Explain what is the most abundant form under which nitrogen is found in nature?
What are persistent organic pollutants?
Is pollution always caused by humans?
What benefits can commensalism offer to a species?
What is an example of intraspecific competition?
What is the nitrogen cycle?
Can food chain present quaternary consumers without having secondary or tertiary consumers?