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Question
How is an oxygen sag curve created?
a. unlined landfills, household chemicals, mining refuse, and industrial discharges
b. breakdown of biodegradable wastes by bacteria depletes dissolved oxygen
c. bacteria from livestock and food-processing wastes, and excess salts from soils of irrigated cropland
d. major erosion of sediments and runoff of toxic chemicals
e. animal feedlots, food-processing facilities, paper mills
Answer
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