Question

give two examples to show that a change can be desirable and undesirable at the same time

Answer 1

 Desirable change:
The changes which are desired(need) to be change are called as desirable changes.
Ex: Change of milk to curd, reopening of fruits…etc
Undesirable change:
The changes which are not desired to change is called undesirable changes.
Ex: Earthquakes, hurrcanes, tsuanmi ...etc

Answer 2

burning of fuel and rain