Environmental Science
Frost typically forms on the inside of a windowpane (rather than the outside) because:

There is less water vapor touching the inside of the pane
None of these
The inside of the pane is colder than the outside
There is more water vapor touching the inside of the pane

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Environmental Science
Definition of ecosystem is

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

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