In the demographic transition model, birth and death rates are high during
a. the preindustrial stage
b. the industrial stage
c. the postindustrial stage
d. the transitional stage
e. the preindustrial stage and the transitional stage
A
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Despite potential problems, the general trend in the production and use of transgenic organisms in Europe, the United States, and the developing world is toward
A) decreased production of bioengineered foods and nonfood crops. B) increased production of bioengineered foods and nonfood crops. C) decreased production of bioengineered foods but increased production of nonfood crops. D) increased production of bioengineered foods but decreased production of nonfood crops.
The sky (lower tropopause) appears blue in color because of
A) diffuse radiation. B) transmission. C) absorption of blue wavelengths of visible light. D) scattering. E) reflection.
Which of the following characteristics is associated with all humid subtropical climates?
a. locations on the west coasts of continents in the middle latitudes b. pronounced winter maximum of precipitation c. warmest month at least 10 degrees Celsius d. a sufficiently durable snow cover to markedly affect winter temperatures
Select the statement that best describes how the process of plate tectonics circulates materials between the asthenosphere and the lithosphere.
A. Some lithosphere becomes asthenosphere at mid-ocean spreading centers and reenters the lithosphere at subduction zones. B. Some asthenosphere becomes lithosphere at mid-ocean spreading centers and reenters the asthenosphere at subduction zones. C. The materials that form the asthenosphere never mix with the materials that form the lithosphere.