If Organic Matter Is Useful in Water as a Nutrient

question 23

Multiple Choice

If organic matter is useful in water as a nutrient source, why does excess organic matter lead to a decrease in aquatic life?

• A)Aerobic bacteria feed on all the organic mater and use up all the oxygen.
• B)Anaerobic bacteria feed on the organic matter and populations increase, leading to consumption of all the food.
• C)Anaerobic bacteria eat all the aerobic bacteria, which leads to loss of oxygen in the water.
• D)The excess organic matter blocks light, which leads to a decrease in photosynthesis and causes a drop in oxygen production.
• E)none of the above

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