Cockroach and earthworm which is harmful
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cockroach are very harmful because it causes many harmful disease in human body but earthworms is less dangerous than cockroach. thanks...
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Among the given options : The harmful living thing is cockroach. Explanation: 1.Cockroaches do not cause any disease but they are vectors or carriers for millions of bacteria that can lead to many diseases like food poisioning to diarrhoea.
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