Environmental Science
Definition of ecosystem is

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

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Environmental Science
Low clouds retard surface cooling at night better than clear skies because:

The clouds are better conductors of heat than is the clear night air
The water droplets in the clouds reflect infrared energy back to earth
The clouds absorb and radiate infrared energy back to earth
The formation of the clouds releases latent heat energy
The clouds start convection currents between them

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