Answer:
cell- is the smallest unit that can live on it's own and that makes up all living Organisims and tissue of the body
tissue- a group of cells that have similar structure and that function together as a unit.
organ- a collection of tissues that structurally form a functional unit specialized to perform a particular function.
organ system- a group of organs that work together to perform a complex function.
sorry I can only define it, I hope it helps.
