Structural organistion in animals attmals attains different lavels as cell - organ system , what is missing in this chain ? Mention the significance of such and organisation .

Explanation

Tissue is the missing in the chain stucural organistion can be shown a cell -tissue - organ -or gan system ,
Number of cells together form number of tissue together form organ which on when unit with several organ form organ - system .
In organisms like Hydra the body is comprised of thousands of cells in which each cell works independenlty whereas in a complex body system as that in humans billions of cells perform various function together via connecting each other through connecting each other through connecting tissue.