Many ecosystems are damaged by attempts to make a quick profit because
A) natural services are valued more than natural goods.
B) ecosystem services require sustained human development.
C) the value of ecosystem services is poorly understood and underappreciated.
D) the prices of most natural goods continue to fall.
C
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Refuse-derived fuel has ________ energy content than raw refuse, but requires energy ________ before burning.
A. About the same; enrichment B. A lower; to sort C. A lower; enrichment D. A higher; to sort E. A higher; enrichment
Although ectotherms can tolerate large ranges in external temperature, they are unable to sustain large
fluctuations in their internal temperatures. Indicate whether the statement is true or false.
Briefly discuss trends in natural gas and coal usage around the world
What will be an ideal response?
Which of the following beds would be easiest for a stream to erode?
A) Lined with gravel and cobbles B) Bedrock C) Lined with sand and gravel D) Lined with silt