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.
Avian influenza-the bird flu - is a virus that infects birds, particularly wild birds such as ducks and geese, but can spread to domestic poultry, such as chickens and turkeys.here are numerous different strains of avian influenza; however, most do not cause illness in people. H5N1 is a strain of avian influenza, and is a concern among the scientific and medical community with regard to its potential to cause a pandemic. The H5N1 strain can infect birds, other animals and people.