Why are diseases such as AIDS, which reduce population density, undermining the ability of developing countries to make the transition to more modern, industrialized societies?

a. They are removing many of the youngest, most reproductively active members of society, limiting population growth.
b. They are removing only men from the population.
c. They are removing older populations that are more likely to adopt new technologies.
d. They are causing "demographic fatigue," which leaves these countries without a professional class.


Answer: d. They are causing "demographic fatigue," which leaves these countries without a professional class.

Environmental & Atmospheric Sciences

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The Precambrian represents less than 50 percent of Earth history. Indicate whether the statement is true or false

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In the globe below, from north to south the local names for the grasslands are



A) Great Plains, pampas, llanos, campos.
B) Great Plains, llanos, campos, pampas.
C) Great Plains, campos, llanos, pampas.
D) Great Plains, llanos, pampas, campos.

Environmental & Atmospheric Sciences

In the Northern Hemisphere, winds move in this direction around a low pressure area: ________

Fill in the blank(s) with the appropriate word(s).

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The ________ consists of a central open space surrounded by structures

A) clustered rural settlement B) dispersed rural settlement C) clustered linear rural settlement D) clustered circular rural settlement E) main street settlement

Environmental & Atmospheric Sciences