One indicator of aquatic health is BOD levels, which measures biological oxygen demand. Healthy systems have low BOD levels. A high BOD level indicates _____.
A none of these
B a highly pure water system with an abundance of autotrophs
C a highly polluted system due to abundant silt particles
D a highly polluted system due to an excess of nutrients
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B=a high polluted system due to abundantly silt partlcals
ankeshsharma:
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Perhaps option B
a highly pure water system with an abundance of autotrophs
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