Why do glasses of ice water, when the ice melts, contain more liquid, even though no liquid is being added? Because the ice is melting (changing form) into water, meaning there’s more liquid despite the glass always containing the same total amount of stuff.
Likewise, when a banana ripens, the long chains of starches break down into simple sugars. Nothing is being added or taken away. There’s the same total amount of stuff, it’s just that some of that stuff is changing form to become sugars.
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