Environmental Science
A high Biological Oxygen Demand (BOD) indicates that:

water is pure
Low level of microbial pollution
High level of microbial pollution
absence of microbial action

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Environmental Science
If a glass of water were surrounded by saturated air:

The water's temperature would slowly decrease
The level of the water in the glass would not change
The water's temperature would slowly increase
The level of the water in the glass would slowly decrease

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