Changes in stool color alone do not cause symptoms. The underlying cause of the change in stool color, texture, or form is responsible for any symptoms. Bowel movements are usually light to dark brown in color, and there is moderate variation among individuals with respect to stool color, quantity and form.
Plants in the Twilight Zone As the amount of light decreases, the size and complexity of plant life also decreases. So whereas there may be flowering plants growing in the entrance zone, the twilight zone is typically marked by mosses and ferns.
twilight zone. noun. 1. any indefinite or transitional condition or area. 2. an area of a city or town, usually surrounding the central business district, where houses have become dilapidated. 3. the lowest level of the ocean to which light can penetrate.