Now that we know about both prokaryotic and eukaryotic cells, let's look at the endosymbiosis theory. This theory suggests that mitochondria and plastids in eukaryotic cells were once independent prokaryotic cells.
Avian influenza (AI) is an infectious viral disease of birds (especially wild water fowl such as ducks and geese), often causing no apparent signs of illness. AI viruses can sometimes spread to domestic poultry and cause large-scale outbreaks of serious disease.
The victims of this virus, chickens, can be immune, but they have to be from special lines, however, with this virus, it is rare. Avian Influenza is a huge problem mainly because it comes through flocks and can wipe out the whole flock in hours. Avian Influenzaâs symptoms are usually unseen.