what is a similarity between unicellular organisms and multicellular
The major similarity between unicellular and multicellular organisms is that both of them contain cell/cells. Unicellular organisms contain one cell and all of their functions are based on that one cell whereas multicellular organisms contain more than one cell and there functions are divided amongst different cells like nervous cells, cardiac muscle cells etc.
Both unicellular and multicellular organisms share some important similarities like the genetic code. Cells in a multicellular organism must work together to a greater extent than unicellular organisms, therefore, there are also some important differences. Organelles With a few rare exceptions, virtually all species of multicellular organisms are eukaryotes, meaning their DNA is contained in a special structure called a nucleus.