Environmental Science
Which of the following groups is absolutely essential functional component of the ecosystem?

Detritivores
Producers and detritivores
Producers
Producers and herbivores

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Environmental Science
The atmospheric greenhouse effect is produced mainly by the:

Absorption and re-emission of ultraviolet radiation by the atmosphere
Absorption and re-emission of infrared radiation by the atmosphere
Absorption and re-emission of visible light by the ground
Absorption and re-emission of visible light by clouds
Absorption and re-emission of visible light by the atmosphere

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