Environmental Science
Definition of ecosystem is

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

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Environmental Science
When clouds are viewed near the horizon, the individual cloud elements usually:

Appear farther apart than is actually the case
Appear closer together than is actually the case
Appear lighter in color than is actually the case
Appear to have more vertical development than is actually the case

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