6. where should you look to quickly find factual information on the causes of the american civil war?

a. encyclopedia
b. readers' guide
c. dictionary
d. concise dictionary of american biography

explanation:

human affect the biosphere by inceasing air pollution , damaging the ozone layer, worsening global warming , producing non - biodegradable waste, and causing deforestation . the combined effect of human activity results in the destruction of ecosystems

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the correct answer is   d. a picture depicting people applauding a country's leader.