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What are the most common carriers of diseases?

What does bread or idli dough rise because of?
Bread Is produced with the help of?
Are onions preserved with the help of oil and spIces and vinegar?


the most common cause of diseases in the form of insects are mosquitoes and in the form of natural resources of water and air.
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when we make bread, we add yeast which causes fermentation and makes it rise.
Oil is isotonic for onions and therefore helps.preserve it.
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