Biology
How are cockroaches and rats harmful to humans?
Hygiene
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Answer
Cockroaches and rats are common household pests. They are harmful to humans in the following ways:
- Cockroaches eat and spoil food, paper and clothes. They are also suspected to be carriers of certain viral diseases, possibly including a cancer-causing virus.
- Rats eat grains and other foods. They also spread germs of certain diseases. Rat-fleas is a parasite that lives on rat's skin. It may carry germs of plague.
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