There are no flies in my house, but if I leave a piece of fruit out too long, they show up. Even if it’s far away from any doors or windows, they’ll be there. So, where do they come from?
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In addition to the explanation about coming in through the actual fruit you bought, your house is not air tight. You may think it is, but it is not. If there is any point of ingress that is roughly 1mm wide, a fruit fly is coming in.
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