Environmental Science
High biological oxygen demand indicates:

moderate microbial pollution
all of these
absence of microbial pollution
intense level of microbial pollution

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Environmental Science
The primary cause of a radiation inversion is:

Infrared radiation absorbed by the earth's surface
Infrared radiation emitted by the earth's surface
Solar radiation absorbed by the earth's surface
Infrared radiation absorbed by the atmosphere and clouds
Solar radiation reflected by the earth's surface

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