Akhi. Evolution is a broad term. What you mentioned is adaptation like Ml.Abu Hajira mentioned. The influenza virus remains as an influenza virus, there is no change in species. That happens in all of us. The humans adapt too. What darwin fanboys claim is that All animals evolved from a single cell blue-green algae etc etc. We do not have to accept it. Also things like humans evolved from apes is blasphemous. !