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

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

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Environmental Science
Definition of ecosystem is

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
A community of organisms interacting with one another

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