Which of the following organs forms a barrier between an animal and its external environment? By: Sunday|Published on: Jan 20|Categories: Agricultural Science WAEC| 0 comments A. Urinary bladder B. Stomach C. Lung D. Skin Correct Answer: Option B B. Stomach Users Also Read These:Cut off Mark for Animal Biology and Environment in UNIBENWhich of the following is a major barrier to…Which of the following is not a barrier to the…The abolition of all forms of trade barriers among…One of the reasons why the government may erect a…SEE ALSO Â Government agricultural regulation are made to control the following except the?