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

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Environmental Science
A food web is

The set of prey species that are consumed by animals in an ecosystem
A set of interconnected food chains, illustrating the tropic relationships among species
The tropic (feeding) levels that can be observed in an ecosystem
Like a food chain

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