Bubonic Plague: The symptoms of the bubonic plague are flu-like symptoms, and discomfort in the lymph nodes. This disease can be spread through insect or flea bites. This disease is not often contagious.
Septicemic Plague: This type of bacteria multiples in the blood and causes severe symptoms (gangrene and internal/external bleeding). This can develop from insect/flea bites or from untreated Bubonic Plague. This disease is not often contagious.
Pneumonic Plague: This plague is extremely malignant. It happens when certain bacteria enters the body, and then invades the lungs. This disease is caused by other plagues that were left untreated. This disease is contagious.
There wasn’t a lot to summarize, but I hope this helps!
Because the tree moves the water and food around through the cambium. If it cannot go through the cambium, they tree will have nothing to eat and slowly, die.
