Where do fruitflies and maggots come from?

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Fruit flies and maggots are attracted to ripe or decaying fruit due to their strong sense of smell. In Holland, leaving an opened banana or melon for a day can quickly attract these pests, which typically remain unseen until the fruit becomes overripe. The presence of fruit fly eggs on fruit when purchased is common, as they can hatch shortly after the fruit is exposed. Additionally, fruit flies can originate from outside, drawn in by the scent of ripe fruit. This cycle highlights the relationship between fruit flies and maggots, as each stage relies on the other for reproduction and survival.
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If you leave an opened banana or melon as long as a single day, there's already tens of fruitflies near it (here in Holland), when you normally NEVER seen them peeking around for a piece of decaying fruit. So how do they know where the fruit is and where do they come from??

Same with maggots...
 
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They have a very good sense of smell and come from outside. That's pretty much all there is to it.
 
If the fruit was ripe when you bought it, it probably already had fruitfly eggs waiting to hatch. The fruitflies could also be coming from outside, where they homed in on the smell of your ripe fruit.
 
fruitflies come from maggots, and maggots come from fruitflies, and chickens come from Safeway
 

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