Question

what is desirable and undesirable change

Answer 1

any changes is desired by humans is a desirable change and the changes which is not desired by men are undesirable changes
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Answer 2

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.