What is the evidence of the similarity in the structure of cells of various organisms?

If we consider various living organisms, then we will see that all of them, with the exception of viruses, have a cellular structure. Cells are of two types: prokaryotic and eukaryotic. The kingdoms of archaea and bacteria belong to prokaryotes. The rest of the kingdoms belong to eukaryotes. All this testifies to the evolutionary origin of all living things. The first on our planet, as many scientists believe, were bacteria. All other living organisms originated from them. Therefore, there are similarities in the cells of different organisms.