Biology
Grade-7
Easy

Question

___________ is mainly liquid waste.

  1. Solid and gas
  2. Sewage
  3. Phosphates
  4. Metals

hintHint:

Waste water collected in sewers.

The correct answer is: Sewage


    • Sewage is the liquid waste that is collected in sewers
    • The waste water that is discharged from a locality is collectively called sewage
    • Sewage can be classified as domestic sewage, storm sewage and industrial sewage
    • A proper sewage system prevents pollution 
    • Improper sewage system can cause spread of disease and pollution in the society 

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