In most developed countries, an epidemiologic transition
A) was followed by a fertility transition, resulting in a demographic transition.
B) prevented a fertility transition, resulting in a demographic transition.
C) resulted from increased deaths due to epidemics and social conditions.
D) was followed by an increase in birth rates and an increase in death rates.
A
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Mie scattering:
A) occurs often on hazy days. B) works best when there are few aerosols in the air. C) diminishes after volcanic eruptions. D) counters the reddening effect responsible for red sunsets and sunrises.
Plants with showy flowers typically ________
A) decrease biodiversity in an area B) are pollinated by wind C) are genetically modified by animals D) are preferentially eaten by herbivorous animals E) are pollinated by animals
Any object that moves has
A. impulse. B. momentum. C. acceleration. D. all of the above
What was an unintended side-effect of the construction of the Aswan High Dam in Egypt in the 1970s?
A) Egypt and its southern neighbor, Sudan, fought a war over control of the area. B) The level of the Mediterranean Sea fell several feet, which hurt several port cities. C) It disrupted international trade in East Africa. D) The Sahara Desert became even drier, due to its impact on the water table. E) It led to the spread of a parasitic disease among the population, schistosomiasis.