Environmental Science
Definition of ecosystem is

The community of organisms together with the environment in which they live
The part of the earth and its atmosphere which inhibits living organisms
A community of organisms interacting with one another
The abiotic component of a habitat

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Environmental Science
The atmosphere near the earth's surface is "heated from below." Which of the following does not significantly contribute to this heating?

Conduction of heat upward from a hot surface
Absorption of infrared energy that has been radiated from the surface
Convection from a hot surface
Heat energy from the earth's interior

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