The decline in approximately 70% of the world's bird species is particularly alarming to scientists because
a. This is the first time any bird species have been threatened with declining numbers.
b. It is not caused by any human activities that scientists can determine.
c. Only land birds are affected, while water birds seem to be maintaining normal population numbers.
d. Birds are excellent environmental indicators.
e. Birdwatching now generates a significant portion of tourist dollars in some countries.
D
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Which of the following areas of Australia/Oceania has NOT faced widespread environmental issues as a result of mining?
A) Nauru B) Hawaii C) New Caledonia D) Australia E) Papua New Guinea
An amino acid is an example of a
a. monomer. b. polymer
Which of the following is a poor choice when trying to reduce the likelihood of a slope failure?
A. adding a gabion and/or a resisting mass at the toe of a slope B. holding soil in place by using plants or netting C. using rock bolts to strengthen rock masses D. reshaping the topography by reducing the slope E. adding water to the slope during a cold snap to freeze it in place
This secondary pollutant is the source of most acid precipitation problems in the Northeast: ________
Fill in the blank(s) with the appropriate word(s).