The hygiene hypothesis predicts that the lowest levels of asthma should occur in people living in
A) poor rural families in developing countries.
B) wealthy families in developing countries.
C) poor urban families in developed countries.
D) wealthy families in developed countries.
A
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Which event does not occur during the decay of potassium-40 isotopes?
A) An electron orbiting near the nucleus enters into the nucleus and combines with a proton to produce a neutron. B) Electrons rearrange, producing x-rays. C) A neutron changes to a proton and emits an electron. D) A proton is ejected from the nucleus.
What makes light absorption in diatoms more effective than just using chlorophyll?
A) Surface-to-volume B) Microbial loop C) Frustule perforations D) Accessory pigments
The largest component of the U.S. population lives in
A) central cities. B) suburbs. C) nonmetropolitan areas. D) rural settlements. E) the second and third rings of the concentric zone model.
The Geysers is a power plant in California that generates electricity ________.
A. by harnessing tectonic plate movements B. directly using the heat of lava C. with flowing surface water D. with flowing groundwater E. with naturally hot water