Question

how do the cells of a multicellular organism differ from those of a unicellular organism?
they are specialized.
they perform all functions.
they are all the same.
they never replicate.

Explanation:

In multicellular organisms, cells differentiate and become specialized to perform specific functions. Unicellular organisms have a single cell that performs all life - sustaining functions. Multicellular organism cells are not all the same (they have different structures and functions based on specialization), and they do replicate (for growth, repair, etc.).

Answer:

They are specialized.