Question

respiratory surface of animals must always be moist

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Answer 1

So that animals could not face any problem while breathing.
Hope my answer is correct.

Answer 2

Yes.. This is to help the occurance of diffusion for the exchange of gases..
Earthworms has a moist surface in its skin for the same purpose..
Even the human lungs are moist for the diffusion of gases to occur from the alveoli..