The use of DDT in the 1950s and 1960s was nearly responsible for the extinction of which familiar bird species?
A. red-tailed hawk
B. common pigeon
C. chicken
D. bald eagle
E. cardinal
Answer: D
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Which country in Southeast Asia was formerly known to have the best healthcare, high literacy rate, and an efficient civil service, but now known as one of the world's most repressive places to live?
a. Myanmar b. Laos c. Cambodia d. Thailand e. Sri Lanka
What causes volcanic explosions?
A. Breaking of rocks during an earthquake B. Collisions between tectonic plates C. Escaping volcanic gases D. Increased melting due to high water content
Was there any time in the last 800,000 years when the concentration of carbon dioxide was higher than it is today?
The question is based on Figure 24-5, showing variations in CO2 and temperature anomalies in Antarctica going back 800,000 years. This temperature record shows the major glacial (cold) and interglacial (warm) periods of the later Pleistocene Epoch (2.58 million to 11,700 years ago). What will be an ideal response?
When it appears that it is no longer profitable to continue fishing as a result of overfishing, the fish populations are said to be ____ extinct.
A. locally B. commercially C. economically D. biologically E. ecologically