What is the difference between multicellular organ and unicellular organ

Multicellular organ is made up of multiple cells to form tissue. Multicellular organisms have a great capacity to survive than unicellular. Unicellular is made up of one cell.

Unicellular organisms are made up of only one cell that carries out all of the functions needed by the organism, while multicellular organisms use many different cells to function.

Explanation:

Multicellular organisms are composed of more than one cell, with groups of cells differentiating to take on specialized functions.