Astrobiology is considered a sub-discipline of microbiology because
A. microbes are known to exist on other planets.
B. all extraterrestrials known are microbial.
C. life elsewhere in the universe is likely to be microbial.
D. only microbes can reproduce under the extreme conditions in outer space.
Answer: C
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Which of the following contributed to the dust bowl in the American southwest during the 1930s?
I) overgrazing by cattle II) clear-cutting of forest trees III) plowing of native grasses IV) lack of soil moisture A) I and II B) II, III, and IV C) I, III, and IV D) I, II, III, IV
Mendel chose to study pea plants because they have a long life cycle that offers ample time for analysis
a. True b. False
What process resulted in domesticated plants, which make up most of today's crops?
A) biomagnification B) artificial selection C) advantageous evolution D) eutrophication
You are a climate scientist who wants to investigate climate change. Which measurement would be the least useful?
A) rainfall in the southeastern United States from 20 years ago to the present day B) a long-term (30-year) study of coral biodiversity in the Australian reef ecosystem C) changes in carbon dioxide (CO2 ) emission levels in China from 25 years ago to the present day D) methane (CH4 ) levels from dairy farms in Iowa during the years 2011 and 2012