Mosquitoes have been controlled in most parts of the world by the spraying of DDT. But after years of repeated sprayings, the number of mosquitoes has been increasing in spite of the continued use of DDT because:
A. each new generation of mosquitoes grew up with DDT as a part of the environment and gradually developed immunity
B. mosquitoes exposed to nonlethal concentrations of DDT learned to avoid food and other matters sprayed with DDT
C. DDT-resistant mosquitoes survived to breed, as did their offspring, until more and more of each year's mosquitoes were resistant
D. none of these
C. DDT-resistant mosquitoes survived to breed, as did their offspring, until more and more of each year's mosquitoes were resistant
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A group of humans that migrates from sub-Saharan Africa to northern Europe is an example of __________
a. genetic drift b. gene flow c. founder effect d. differential mortality
The site called Skh?l is found in:
A. South Africa B. Southern Europe C. India D. Israel
A comparison of the production, consumption, and leisure time of middle-class French people and Machiguenga horticulturalists in Peru showed that French men and women __________
a. consume much more, work more, and spend less time on leisure than Machiguenga men and women b. consume much less, work more, and spend less time on leisure than Machiguenga men and women c. consume much more, work less, and spend less time on leisure than Machiguenga men and women d. consume much more, work more, and spend more time on leisure than Machiguenga men and women
A species that can survive in a variety of ecological niches is referred to as a:
A. comprehensive species B. generalized species C. global species D. ranging species