Viruses are not living things. Viruses are complicated assemblies of molecules, including proteins, nucleic acids, lipids, and carbohydrates, but on their own they can do nothing until they enter a living cell. Without cells, viruses would not be able to multiply. Therefore, viruses are not living things
this is a compound sentence because we are joining two sentences with the help of and i.e. she cooks well, she eats, these two sentences are joined with and
