Geography
What are pathogens? How do they enter human body? Name any three diseases caused by these pathogens.
Pollution Effects
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Answer
Pathogens are disease causing organisms like bacteria, viruses and protozoa.
Most of the waste waters especially sewage contain pathogens like bacteria, viruses and protozoa. These pathogens enter the human body from contaminated drinking water and are responsible for several waterborne diseases like cholera, typhoid, diarrhoea, dysentery etc.
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