Do unicellular organisms such as bacteria and yeast cells exhibit differentiation?

The unicellular organisms like bacteria, prokaryotes and yeast cells are living organisms that are made up of single cell. It is not necessary that they show differentiation because they are capable of performing all the life functions in a single cell itself.

If these show differentiation, they produce identical sister cells which are also identical to the mother cell.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".