What are tropic levels?
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What are persistent organic pollutants (POPs?
Define carbon cycle?
What are the main causes of the loss of the biological diversity nowadays?
What is a community? What is the difference between the concepts of community and population?
What are pioneer species? What is the role of the pioneer species?
Explain the analyses provided by the study of human age pyramids?
Define biodiversity?
What are societies?
What do energy pyramids represent?
Explain the primary energy source for life on earth?
What is selective waste collection?
What are the main chemical compounds that destroy the ozone layer?