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.
Infectious Respiratory diseases Avian Inï¬uenza Infectious Respiratory diseases Avian Inï¬uenza Avian Inï¬uenza (AI) Cause Avian Inï¬uenza is caused by an Orthomyxovirus; there are several serotypes. Currently we know there are 16 H- types and 9 N-types and they can show up in all kinds of combinations. For poultry the most important