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.
A watershed is an area of land that drains into a particular river, lake or other body of water. Watersheds are sometimes called âbasinsâ or âdrainage basins.â. We all live in a watershed. Some watersheds, like that of a stream or creek, are small. Others, like the Chesapeake Bay watershed, are large.