Immunization against an influenza virus does not provide long-term protection against the disease because: * The virus destroys the vaccine before it has a chance to work
The serum in the vaccination expires within the body
The virus undergoes genetic changes
Antibodies do not work against viruses

The image shows the evolution of a species of fish. a few fish from a population developed different social behaviors and evolved into different species. two fish according to the image, the fish underwent . the new species of fish had mating seasons that were different from that of the original fish. because of the differences in mating seasons, the fish underwent reproductive isolation. this mode of isolation would be .