Globally, Russia has the highest rate of measles immunization
Indicate whether the statement is true or false.
Answer: TRUE
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Which air pollutant, emitted by volcanoes, is a concern of climate scientists?
A. SO2 B. NO2 C. N2O D. CO2
Which of these hazardous chemicals is polluting waterways in Central and South America due to small-scale gold mining practices?
A. mercury B. cyanide C. arsenic D. chromium
Which of the following chemicals is implicated in both global warming and ozone depletion?
A. chlorofluorocarbons B. methane C. carbon dioxide D. sulfur dioxide
Some regions of Iceland once were covered with forests. However, centuries ago humans logged the trees and grazed sheep on the logged regions, preventing natural regeneration. This situation, in which one ecosystem has now been converted to another, represents
A) a tipping point for this ecosystem with fewer ecosystem services than before. B) the power of natural resilience mechanisms. C) reverse ecological succession. D) a sustainable approach to ecosystem management with a positive feedback loop.