How Is an Oxygen Sag Curve Created?​

Multiple Choice

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​