Ethylene is a natural and odorless hormone found in most fruits, such as bananas, apples, and pears, that aids with ripening. It is also responsible for opening flowers and leaf shedding. It omits as a gas in trace amounts and is present throughout the fruit's life, even after its been cut off from its stem. This is why the banana in the photo appears overripe. The ethylene inside of it continued to promote ripening.
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