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How do fruit flies come out of fruit? I know they do. I put some watermelon in a sealed jar, 2 days later the flies were in the jar.

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They lay very tiny eggs in the fruit.

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I honestly have no idea. But holy crap thats amazing.

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Sounds as if someone knew about your experiment and played a prank on you.

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The little buggers lay their larve/eggs in your fruit. UGH.

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They lay their eggs prior to the fruit ever hitting the store shelves (typically). If you live in a warm, humid area like FL, then they can lay their eggs at any time (in your house, at the store, etc). When the fruit begins to rot/decompose it releases gasses and enzymes that trigger the eggs to hatch. When the fruit is getting rotten it is soft and mushy and easier for the flies to consume; that's why the eggs wait until a particular stage of decomposition to hatch.

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