Name two animals that exhibit cutaneous respiration. What special features of the skin make cutaneous respiration effective?

(N/A) $1$. Two animals that exhibit cutaneous respiration are: $Frog$ and $Earthworm$.
$2$. The special features of the skin that make cutaneous respiration effective are:
- The skin is kept moist, which allows gases to dissolve.
- The skin is thin, which facilitates the diffusion of gases.
- The skin is highly vascularized, meaning it has a large number of blood capillaries near the surface to transport oxygen and carbon dioxide.