yes, ranch dressing is mainly oil, so it is very sensitive to lipid oxidation and will turn rancid if left out over night at room temperature
The four people left at the ranch on Saturday night are the cowboy, the rancher, the cook, and the cow.
Only if where it was left out was a cold as a refrigerator. Otherwise, it would not be safe to eat.
If the Ranch has been opened, it should be refrigerated within 4 hours from the time it is left out (IF it was at a cool, room temperature--if exposed to warmer temperatures, no more than 2 hours). Ranch is made with Buttermilk, and as with other dairy products, they can spoil relatively quickly. If you are unsure, it is much safer to just discard it, and start over, rather than risk a foodborne illness.
Yes. You can eat left over Pizza. Only if you put it in the refrigerator. If you leave it out like on the stove or something you might get sick.
Unless where you left it out is as cold as a refrigerator, I would not recommend eating it.
You can but should't, as Indian food is best eaten immediately after cooking or after refrigeration.
how long is flu vaccine good for if left out of the refrigerator
Suspension
vinaigrette
7
No
Eventually, yes. It will also spoil if left inside the refrigerator, it just takes longer. Most vinaigrettes are made of nothing more than vinegar, oil and some herbs, all of which are shelf stable. The vinegar will never go bad, but herbs can loose their potency and oil will eventually go rancid. The onset of rancidity and the potency of the herbs can be maintained by keeping it refrigerated and the container sealed.