Question

Fish die in water bodies polluted by sewage due
to
(a) pathogens
(b) clogging of gills by silt
(c) reduction in oxygen
(d) foul smell

Answer 1

Answer:

pathogens is right answer.......

Answer 2

Fish die in water bodies polluted by sewage due to reduction in oxygen level

Explanation:

Sewage is a wastewater that create environmental hazards as it transmit diseases that are diarrhea, cholera and other diseases that are contaminated by water.

The chemical sewage contain raw material that is utilized by aquatic plants and algae for their development and thus they increase in number which block the penetration of sunlight. As they are increased in amount, the level of dissolved oxygen decreases which in turn creates lack of oxygen availability and that affects the fishes and other aquatic organisms and may kill them as they obtain oxygen from water.