Similarities and differences between unicellular and multicellular organisms?

The similarity between unicellular and multicellular organisms is that both are composed of a cell. In both representatives, it has a similar chemical composition, a similar structure (organelles), in both representatives the cell divides during reproduction (two daughter cells are obtained from the maternal one), metabolism and vital processes are similar. These organisms differ in that, in a single-celled cell, it performs all the functions necessary for life on its own. That is, it provides respiration, nutrition, excretion, irritability, growth. In a multicellular organism, cells according to similar functions are combined into tissues, tissues into organs, and the organs themselves are interconnected with the help of nervous and humoral regulation.