Inhabiting the portion of the oceandeeper than 2000 m and shallower than6000 m. The abyssal realm is the largest en-vironment on earth. Abyssal fauna tend to beblack or gray,unstreamlined,and delicatelystructured.棲息于海洋中水平面2 000m以下、6 000m以上的。深海海域是地球上最大......（本文共 254 字）     [閱讀本文] >>