Step-by-step explanation:
The body of complex organisms is made up of cells, group of cells along with intercellular substances make up the tissues, many tissues in a special proportion and pattern makes organs and the physical & chemical interaction of organs makes organ systems. And many organ systems makes up the organism.









Cells, tissues, organs and organ systems split up the work in such a way that exhibits division of labour and is responsible for survival of an organism as a whole.