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Question
How are cockroaches and rats harmful to humans?
Solution
Cockroaches and rats are common household pests.
(i) Cockroaches are involved in spoiling food, paper and cloth. They may act as carriers of viruses, especially those which cause cancer.
(ii) Rats eat grains and other foods. They also act as carriers of certain pathogens. A parasite named rat-fleas lives on rat's skin. It possibly carries the germs of plague.
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