What are the common features of the respiratory organs in aquatic and terrestrial animals?

(N/A) The common features of respiratory organs in both aquatic and terrestrial animals are as follows:
$1$. Large surface area: Respiratory organs have a large surface area to facilitate the maximum exchange of gases.
$2$. Thin-walled: The surface of the respiratory organs is very thin to allow for easy diffusion of gases.
$3$. Richly supplied with blood: They are well-supplied with blood vessels to ensure efficient transport of oxygen and carbon dioxide.
$4$. Well protected: These organs are usually located inside the body or protected by structures to prevent damage and maintain a moist environment.