A sludge digester as part of an urban wastewater treatment facility produces a useful fuel called
A) carbon dioxide.
B) ammonia.
C) biogas.
D) oxygen.
C
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Please discuss the history of Korea, explaining how it came to be divided into two countries. What is the current situation in South Korea and North Korea?
What will be an ideal response?
In 1957, the Soviet space program launched _______________, the first artificial Earth satellite.
Fill in the blank(s) with the appropriate word(s).
The bottom of the euphotic zone is where
1.there’s no more light at all, unmeasurable.
2.there’s insufficient light for any photosynthesis to occur.
3.use of carbohydrates in respiration equals their photosynthetic production.
4.phytoplankton respiration is zero.
Which of the following is not typical of U.S. suburbs?
A) Residential density is as high as the inner city. B) There is high physical separation between homes, work, and shopping. C) There is congested traffic due to inadequate road networks. D) There are unclear city borders.