What is essential feature of respiratory organ of different terrestrial animal

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There are various features among terrestrial organisms that aid in respiration. Some animals exchange gases through their moist skin surface, insects have tracheal systems for exchange of gases and higher animals have lungs. Common features of all these respiratory organs are as follows:

  1. All the respiratory organs have a large surface area to transport/exchange enough oxygen.
  2. All the respiratory organs have thin walls for easy diffusion and exchange of respiratory gases.
  3. All the respiratory organs such as skin, gills and lungs, have a rich blood supply for transporting respiratory gases.

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