You look in the refrigerator and find some orange drink you had forgotten was there. the drink now has an "off" taste and bubbles. what is the most likely explanation for the changes in the drink? explain the process

Answer : The main reason is because of fermentation the orange drink has off taste and bubbles in it.

Explanation : When the orange drink was opened and kept in the refrigerator it got exposed to the atmospheric micro-organisnms, which when started to decompose the drink generated the carbon dioxide bubbles and gave it a bad taste. The decomposed drink may be have turned into vinegar or some other compound which gave it a bad taste after the fermentation process.