An Oxygen Sag Curve Occurs When

question 49

Multiple Choice

An oxygen sag curve occurs when

• A) Fish population numbers sag.
• B) Heavy metals that have entered a stream bind oxygen molecules and remove them from the available oxygen supply.
• C) The breakdown of biodegradable wastes by bacteria lowers the available oxygen in the water for organisms with high oxygen requirements.
• D) Carbon dioxide values exceed dissolved oxygen values.
• E) Oxygen content in the air around a particular body of water becomes slightly lower than normal

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