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 where all of the water that is under it, or drains off of it collects into the same place (e.g. The River). Most of the watersheds in Idaho are part of the Columbia River Basin Watershed, which drains into the Pacific Ocean! Precipitation.