In the following question, two columns are given, containing three phrases each. A phrase from the first column may or may not connect with a phrase from the second column to make a grammatically and contextually correct sentence. There are five options, four of which display the sequence(s) in which the phrases can be joined to form a correct sentence. If none of the phrases make a correct sentence, mark ‘None of these’ as your answer.

Column (1)	Column (2)
(A) In mammals and amphibians, the waste	(D) of the skin and the structures or growths that cover it.
(B) The integumentary system consists	(E) to protect animals from the hazards of their environment.
(C) The most obvious function of the system is	(F) ammonia is turned into urea.