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.
Yet it does. Many of the animals here are soft-bodied, which allows them to absorb pressures which might injure or kill other species. Like the animals of the Twilight Zone above, these creatures often survive by eating organic material which drifts down through the depths. Others actually feed off the earth itself, consuming bacteria produced from the methane and sulfides seeping through the ocean floor.