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.
1 Influenza (Fl u)Publication Date: September 25 th 2015 What is influenza (a lso called flu)? Influenza is an acute contagious respiratory illness caused by infectionwith an influenza virus. Influenza can occur throughout the year butinfluenza activity usually peaks in winter.There are three types in all with influenza A and influenza B causingthe majority of infections. A third type, influenza C, is rarely reportedas a cause of human illness.Influenza viruses infect the nose, throat and lungs.