How Is an Oxygen Sag Curve Created

Multiple Choice

How is an oxygen sag curve created?

A) The use of unlined landfills, household chemicals, mining refuse, and industrial discharges affects oxygen concentration.
B) The breakdown of biodegradable wastes by bacteria depletes dissolved oxygen.
C) The production of bacteria from livestock and food-processing wastes, and excess salts from soils of irrigated cropland absorbs oxygen.
D) The erosion of sediments and runoff of toxic chemicals react with oxygen.
E) The use of animal feedlots, food-processing facilities, and paper mills depletes oxygen levels.