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.
Different kinds of creatures are found in different zones of the ocean: THE SUNLIT ZONE (surface to 330 feet). This is the brightest and warmest of the zones. Plants and algae (AL-jee) can grow here, and it is home to a huge variety of animals.t's the shallowest of the zones, but is more crowded with creatures than the other zones. THE TWILIGHT ZONE (330 feet to 3,300 feet). Things get dimmer and colder as the water gets deeper. Plants and algae can't survive here, and the animals in this zone are specially adapted to living in darkness.