Environmental Science
Definition of ecosystem is

The part of the earth and its atmosphere which inhibits living organisms
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

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Environmental Science
During the winter solstice in the Northern Hemisphere:

Astronomical winter begins in the Northern Hemisphere
The noon sun is overhead at 23.5o S latitude
All of these
At middle latitudes in the Northern Hemisphere, this marks the longest night of the year

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