📝 Multiple Choice Question
General-science
In the context of water pollution, what does a high Biological Oxygen Demand (BOD) usually indicate?
A
The random changes in pH values
B
Increasing amount of carbon dioxide
C
Changes in turbidity
D
The water is heavily polluted with organic matter
Explanation
A high BOD means more oxygen is being consumed by microorganisms to break down organic pollutants, reducing oxygen available for aquatic life.
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