Which of the following is not a cause of the ejection of nutrient-providing algae from coral?
A) pollution
B) sedimentation
C) oceanic acidification
D) warming sea-surface temperatures
E) pollution, sedimentation, acidication, and warming temperatures all contribute to this phenomenon.
E
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Which of the following is an example of an epidemiological study?
A. The cancer rate of people living downwind to a nuclear power plant was compared with those living upwind. B. Rats were given high concentrations of arsenic for six months and the control group was given a placebo. C. A study of drug overdoses in Los Angeles revealed that cocaine cut with animal deworming compound is dangerous. D. A man in Phoenix ate a banana and died riding his bicycle on a crowded street in the middle of the summer.
A tree harvesting method that involves cutting intermediate-aged or mature trees singly or in small groups is called
a. clear-cutting b. strip cutting c. selective cutting d. patch cutting e. landscape cutting
Meridians of longitude measure
A. positions north or south B. depths of the oceans C. positions east or west D. heights of mountains
In the past two decades, China's economic reforms have allowed _________________.
Fill in the blank(s) with the appropriate word(s).