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.
Type A flu is the most common type of influenza. Type A influenza symptoms include respiratory symptoms like coughing and sneezing and a runny nose, as well as influenza symptoms like headache, muscle aches, and fever.ype A flu is the most common type of influenza. Type A influenza symptoms include respiratory symptoms like coughing and sneezing and a runny nose, as well as influenza symptoms like headache, muscle aches, and fever.