Death due to disease is called death by natural causes. There are four main types of disease: pathogenic disease, deficiency disease, hereditary disease, and physiological disease. Diseases can also be classified as communicable and non-communicable disease.
A watershed is the area of land where all of the water that falls in it and drains off of it goes to a common outlet.
What is a watershed? It's literally a ridge of high land dividing two areas that are drained by different river systems; figuratively, it means a turning point -- a moment in time that involves a â¦ decision or event that changes the course of the past and leads someplace else.