Answer:
Addition
of undesirable chemicals like pesticides, fertilisers, industrial wastes and
domestic wastes not only kill the aquatic organisms, they also cause water- borne
diseases. With the addition of pollutants, the phytoplankton and other organisms
require more oxygen for their degradation, thus decreasing the amount of oxygen
available in water. Due to this reduction in the dissolved oxygen in water,
there are adverse effects on the aquatic organisms leading to their deaths.
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