Darwin suggested that the mechanism by which evolution proceeds is ________. Fill in the blank(s) with the appropriate word(s)
natural selection
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Fossil fuels and minerals are found in the
a. Atmosphere b. Geosphere c. Biosphere d. Hydrosphere e. Troposphere
Rivers collect water from runoff and
A. condensation. B. evaporation. C. groundwater. D. flooding.
Which one of the following processes is NOT one of the steps in the lifecycle of a midlatitude cyclone?
A. A disturbance develops along the polar front as cold and warm air masses converge B. Two warm or hot air masses converge resulting in convergent lifting C. Counterclockwise flow, in the northern hemisphere, pulls moist air into a low pressure center D. An occluded front, along which cold air uplifts warmer air
After the USSR collapsed, Russia's population began a steep numeric decline due to __________.
a. high death rates because of alcoholism, heart disease, and the collapse of the social safety net b. declining birth rates as a result of economic and social crisis c. a demographic shift whereby Russians moved to other parts of the world d. all of these are correct e. declining birth rates as a result of economic and social crisis, and high death rates because of alcoholism, heart disease and the collapse of the social safety net