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Solid waste occupies lots of lands and spoils the value of the area.

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Generally, municipal solid waste includes organic wastes, paper, plastic, glass metals and other wastes. the majority of solid waste is organic waste.

Most solid waste comes from industrial areas.

Solid wastes means solid or semisolid, nonsoluble material such as agricultural refuse, demolition waste, industrial waste, mining residues, municipal garbage and sewage sludge.

The biological pollutants include _________. ()

A. various microorganisms
B. viruses
C. worms
D. algae