Answer the following question:
Answer variants:
Cooking food
Changes that cause damage, loss, or problems
Change produce positive results, and usually encouraged
Changes that are useful and needed
Changes that are harmful or unwanted
Spoiling of food
Differentiate desirable and undesirable change. 
 
i. Desirable change: 
 
 
 
Example:
 
ii. Undesirable change:
 
 
 
Example: