A change which is useful to us is called a ___________.
Fast changes
Slow changes
desirable changes
undesirable changes.
The changes which cannot be reversed even by changing the conditions is called____________.
reversible changes
irreversible changes
undesirable changes
The changes which repeat themselves at regular intervals of time are called___________.
Undesirable changes
Periodic changes
Non-periodic changes
The changes which are brought and controlled by man are called__________.
Natural Changes
Man-made changes
Fast change
desirable change
