Environmental Science
_________ are used for converting saline or brackish water into pure distilled water.

Solar water-heating
Solar cookers
Photo voltaic cells
Solar desalination systems

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Environmental Science
Definition of ecosystem is

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
A community of organisms interacting with one another

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Environmental Science
A food web is

The tropic (feeding) levels that can be observed in an ecosystem
The set of prey species that are consumed by animals in an ecosystem
Like a food chain
A set of interconnected food chains, illustrating the tropic relationships among species

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