Answer : When a raw egg is placed in vinegar then it dissolves the shell of egg and makes it a naked egg.
Explanation : The shell of the egg is made up of calcium carbonate and when placed in vinegar which is mainly made up of acetic acid, dissolves the outer shell covering of calcium carbonate and makes the egg naked. This makes the raw egg bouncy in nature.
A short term environment change would be drought, smog, volcanic eruptions, and blizzards. All because it only last for a small period of time and it can affect the way certain species will have to adapt to certain environments.
Frogs is the answer.......... :)