Environmental Science
Definition of ecosystem is

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

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Environmental Science
The lag in daily temperature refers to the time lag between the:

Minimum and maximum solar energy received at the surface for a given day
Time of minimum temperature and the time of maximum solar radiation
Sunrise and sunset
Time of maximum solar radiation and the time of maximum temperature
Minimum and maximum temperature for a day

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