Answer Posted / john mathew
there are many harmful activities of bacteria:-
1.causes diseases in humans.
2.causes diseases in animals.
3.causes diseses in plants.
4.spoilage of food-if food is not cooked properly,then
microorganisms will grow &produces toxic substances,that
results in food spoilage.eg.salmonella
5.food poisoning-health peoblems caused due to the intake
of spoiled food.
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