Which of the following is not an aerosol present in Earth's atmosphere?
A) sea salt
B) ozone
C) sulfuric acid
D) ash
E) dust
B
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The case of the passenger pigeon best illustrates the
A. strength of natural selection. B. theory of evolution. C. concept of coevolution. D. role humans play in extinction of species. E. excellence of enforcing laws to protect species.
Which of the following lists gives the correct sequence of trophic levels in a food chain?
A) autotrophs, heterotrophs, decomposers B) producers, primary consumers, secondary consumers, tertiary consumers C) consumers, producers, decomposers D) omnivores, carnivores, herbivores, autotrophs E) Both A and B are correct.
What are the effects of improvements in transportation?
A) promote spatial interaction B) stimulates specialization C) increases land and labor productivity D) promotes more efficient use of capital E) all of the above
The frequency-magnitude relationship predicts that any 100 km segment of the San Andreas Fault should experience an earthquake magnitude of 6 on average (enough to cause property damage) every ____ years
a. ?8 b. ?80 c. ?800 d. ?8,000 e. ?80,000