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. Twilight zone is the mental state between reality and fantasy, or the lowest level of the ocean that light can penetrate. 1  When you come home and your extremely messy teenager has cleaned the house from top to bottom, this is an example of a time when you might feel you are living in the twilight zone.