Scientific reason on why fruit ripen in paper bags? What causes it?

I heard that if you put certain fruit in a paper bag, it speeds up the process of ripening that fruit. I think I heard that putting a banana in with the fruit will increase the speed even more. What is the scientific reason behind this? And which fruit is affected by this (i'm sure not all)? And does a banana... show more I heard that if you put certain fruit in a paper bag, it speeds up the process of ripening that fruit. I think I heard that putting a banana in with the fruit will increase the speed even more. What is the scientific reason behind this? And which fruit is affected by this (i'm sure not all)? And does a banana in the bag as well help? If so, why?
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