An organ system is made of working together to do a special job plz

The answer is:
An organ system is made of many cells working together to do a special job.
 ~ Hope this helped  :)

An organ is made of organs because it's part of the organization of life.
And the organization of life are:
cell - come together to form organ
organ - together they form organ system
organ system - come together to form organization
organization - this come together to make organism
organism
so my first answer was right.