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.
The bathyal zone is a marine ecologic realm that is deep below sea  level and is in permanent darkness. The animals that live there are  carnivorous because there is no prim â¦ ary production of plants.Eels,  squid, crustaceans, some fish, large whales, sponges, octopuses,  and sea stars live in this deep sea area.he bathyal zone is a marine ecologic realm that is deep below sea  level and is in permanent darkness. The animals that live there are  carnivorous because there is no prim â¦ ary production of plants.