Final answer:
Coke can be left out for a short time before its taste and carbonation start to degrade. It is best to consume opened coke within 1-2 days.
Step-by-step explanation:
Coke, or soda, can be left out for some time before it goes bad. While it does not necessarily spoil, the taste and carbonation can begin to degrade after being exposed to air for extended periods.
As a rule of thumb, it is best to consume opened coke within 1-2 days to enjoy its optimal flavor and fizziness.
However, it is important to keep in mind that coke that has been left open for too long or has been contaminated may become a breeding ground for bacteria or other microorganisms, posing potential health risks.