Denitrification in sewage treatment systems requires
A) the bubbling of oxygen into waste sewage.
B) the addition of water to waste sewage.
C) an anaerobic environment.
D) high-voltage electrical discharges.
C
You might also like to view...
Long-range forecasts predict whether it will be drier/wetter or wetter/cooler than normal
Indicate whether the statement is true or false
What did the Mars rover Opportunity discover on Mars that relates to questions about the existence of water on Mars?
A) The rover found sedimentary rocks that contained minerals that could only have formed by precipitation from water. B) The rover found no evidence of water ever having been on Mars. C) The rover found ice in the soil. D) The rover found liquid water emerging from a spring, freezing to ice.
One of the most important insect pollinators has been ________
A) hornets B) hummingbirds C) fruit-eating bats D) honeybees E) wasps
Which of the following is an example of greenwashing?
A) ecolabeling B) discounting future effects C) using biodegradable paints D) covering up environmental injustices E) creating the illusion of green or sustainable practices