A cell is a functional unit of living organisms because
A. multicellular organisms are made up of cells
B. all cells in a multicellular organism function as a single cell
C. the function of a multicellular organism is the sum total of the functions of its constituent cells
D. the function of a single cell is superior to that of the multicellular organism
E. the cells of a multicellular organism are similar in structure

Correct Answer: Option A

multicellular organisms are made up of cells