The most authoritative answer in 2024
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Lily Campbell——Studied at University of Oxford, Lives in Oxford, UK
Apparently,
bananas have to be near other
bananas, or similar fruits that give off ethylene gas in order to ripen. ... The
yellow comes from the diminishing amount of chlorophyll as the banana ripens and turns from green. The banana then turns brown as the sugars ferment within the banana and its peel.
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