Which of these substances is/are present in sewage?

Dissolved impurities

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Undissolved impurities

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Non – biodegradable impurities

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Microorganisms

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Solution

The correct options are
A
Dissolved impurities

B
Undissolved impurities

C
Non – biodegradable impurities

D
Microorganisms

Sewage contains

dissolved impurities (such as mercury and lead salts),

undissolved impurities (such as faecal matter)

non-biodegradable impurities (such as plastics).

Micro-organisms

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