Refrigeration is important or food such as meat and dairy products would go off and become unedible. Also you won't be able to run you AC.
All pickles need refrigeration, once the jar has been opened.
no,
Yes it does need regrigeration.
Once it's open, any mayo needs refrigeration.
Refrigeration
It slows their spoilage.
No
No
In my experience, a tuna fish sandwich can survive for some hours without refrigeration - you can take one to school with you in your lunchbox - but for any longer period of time, yes, it would need refrigeration.
YES!
yes, it does.
yes