Explain the typical conformation of the age pyramids of underdeveloped countries?
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Explain the main chemical compounds that destroy the ozone layer?
Why transgenics are considered a threat to the environmental safety?
Define ammensalim?
What are the advantages of leguminous crop rotation in agriculture?
Define global warming?
What is the difference between the concepts of community and population?
What is commensalism?
Define commensalism?
Which terrestrial vertebrate group is extremely rare in deserts?
What is the difference between the concepts of food chain and food web?
Explain the main means by which autotrophic beings obtain energy?
Under which form is nitrogen fixed by the living beings.