An oxygen sag occurs most often
A. After the water recovers from the pollution source
B. Immediately downstream from a pollution source
C. In estuaries closest to a pollution source
D. Immediately upstream from a pollution source
E. At any of these places
Answer: B
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Which of the following is a common "trigger" of landslides?
A. vegetation B. lava flows C. earthquakes D. All of the choices are correct.
The H1N1 virus outbreak that circled the world in 2009 first arose in ________
A) birds B) humans C) mosquitoes D) pigs
?What is the difference between net energy and net energy ratio?
Fill in the blank(s) with the appropriate word(s).