The skin serves as protective covering ,the skin act as respiratory function.The capillaries containing the haemocoelomic fluid extends in between the cells of the epidermis .The carbon -di-oxide of the haemocoelomic fluid passes out and the oxygen dissolved in water .The skin is always kept wet by the surroundings water.The mucus secreated by the epidermal slime glands also prevents it from drying on exposure.
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