The fact that life expectancy has increased significantly over the past 60 years in developing nations is primarily a result of the
A) epidemiologic transition.
B) cultural transition.
C) demographic transition.
D) socioeconomic transition.
Question 2
Which of the following best describes crown fires?
A) They create a mosaic of successional stages in an ecosystem.
B) They decrease biodiversity by eliminating species that are fire resistant.
C) They increase the later stages of succession.
D) They are not a natural factor in undisturbed ecosystems.
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