Environmental Science
An ecosystem gradually merges with an adjoining one through a transitional zone is called the ______________

shore effect
ecological footprint
Ecological niche
ecotone

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

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

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