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.
1 Twilight or disphotic zone-The twilight zone is the middle zone in the ocean. 2  It runs from about 600 feet deep to around 3,000 feet deep depending on how murky the water is. 3  There is too little sunlight for plants to live here. 4  Animals that live here have adapted to living with little light.