The hierarchical (also known as cascade) diffusion pattern by which HIV/AIDS spread across the world is characterized by moving across the world's

A) lowest income countries.
B) major urban areas.
C) most popular tourist areas.
D) island countries.
E) tropical regions.


Answer: B

Environmental & Atmospheric Sciences

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Resources that include sand, gravel, crushed stone, salt, and sulfur are known as

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

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If organisms are unable to generate enough genetic diversity to survive in a changing environment, they

A) may produce more offspring. B) sometimes go extinct. C) may evolve by non-genetic mechanisms. D) will start to reproduce asexually.

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The minimum tidal range happens during ________ tides

A) fall B) neap C) spring D) summer E) winter

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