Which of the following have led to a reduction in birth rates and population growth in most regions of the world?
A) increased education (especially for women)
B) economic opportunity
C) urbanization
D) all of the above
Ans: D) all of the above
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Grassland expansion is associated with which of the following variables?
A. increased rainfall and decreased atmospheric CO2 B. increased rainfall and increased atmospheric CO2 C. decreased rainfall and decreased atmospheric CO2 D. decreased rainfall and increased atmospheric CO2 E. increased CO2 and increased sunlight availability
Although exceptions do exist, which is a distinctively amphibian trait?
A) Juveniles have gills, and adults have lungs. B) Respiration occurs through the skin. C) Skin is smooth with no scales, feathers, or hair. D) All of these are distinctive amphibian traits.
A spot where two continental plates are sliding past one another may be prone to
A) volcanoes. B) earthquakes. C) tsunamis.
Which of the following plant hormones stimulates development of an abscission zone in the leaf petiole?
A. abscisic acid B. ethanol C. auxin D. ethylene E. gibberellins