Which physical forces cause groundwater to flow?
a. Gravity
b. Molecular attraction
c. Pressure
d. All of the above
e. Both a and c
Answer: e. Both a and c
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Desertification occurring in the grasslands of the Sahel, bordering the Sahara, is the result of
A) careless overgrazing by local herders. B) expanding beef production for U.S. and European markets. C) a complex set of environmental, cultural and political economic factors. D) industrialization and urbanization. E) droughts and other acts of nature or God.
Which of the following enzymes accelerates transcription?
A) phosphorylated protein kinases B) ribozymes C) tRNA synthetases D) all of these
Surface cyclones are accompanied by divergence aloft
Indicate whether the statement is true or false
A monocultural agriculture community is
A) not stable, but resilient B) neither stable nor resilient C) stable, but not resilient D) both stable and resilient E) moderately stable and resilient if agriculturalists take proper measures.