Question

what are desirable and un desirable changes

Answer 1

Desirable changes are the changes which are desired and undesirable changes are the changes which are not desired.

Answer 2

Undesirable changes- the changes which are unexpected outcomes of given changes are called as undesirable changes such as boiling milk and expecting it to be pasteriuzed but it becomes spoiled milk.

Desirable changes - these are the changes we expect out of something or an action desired out of the changes such as boiling milk & processing it into a curd.