In Sub-Saharan Africa, the adoption of agriculture led to an increase in mosquitos, which in turn lead to a spread of the human gene for Sickle-Cell trait, because the heterozygous genotype produces a heightened resistance to malaria. This is an example of:

a. anthropological racism.
b. biocultural evolution.
c. eugenics.
d. biological determinism.


Answer: b. biocultural evolution

Environmental & Atmospheric Sciences

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A. increase; less sensitive B. increase; more sensitive C. decrease; more sensitive D. decrease; less sensitive

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What type of stress could form the fault in this figure?



A) Confining pressure
B) Horizontal tension
C) Horizontal compression
D) Horizontal pushing
E) Any of these is correct.

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In the ____________________ and ____________________ method of protecting slopes, material is

removed from the top of the slope and used as fill at the base. Fill in the blank(s) with the appropriate word(s).

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The boundary between two adjacent air masses is called

A) entrainment. B) a front. C) adiabatic. D) an air strip.

Environmental & Atmospheric Sciences