Some virus species can infect an individual host more than once because they change the shape of molecules exposed on the surface of their virions [VY-re-ons] so that they are no longer recognized by the host's immunological memory. The influenza virus can make sudden and drastic changes in these molecules due to a phenomenon called reassortment. Which of the following contributes to the process of reassortment?

W) Widely varying strains of influenza

X) The diversity of animals infected by influenza

Y) The segmented genome found in influenza

Z) The lack of effective antivirals against influenza until recently
Y) THE SEGMENTED GENOME FOUND INFLUENZA