What feature is specialized about amphibian skin?

What feature is specialized about amphibian skin?

• A. Its skin is specialized for respiration and moisture absorption.
• B. It is covered in scales.
• C. It is used for vitamin synthesis.
• D. It is fused to the underlying muscles.

Answer: (B)

Amphibian skin is designed to exchange gases and stay moist to absorb water, which is essential for their survival. The skin is thin and highly vascular, so gases can diffuse directly through it, supplementing the lungs in many species. Keeping the skin moist with mucus is crucial because diffusion happens best when the surface remains wet, and it also allows some water to be absorbed from the environment. Because of this moist, permeable nature, amphibian skin is not covered in scales—that feature is more typical of reptiles and many fishes. The idea that the skin is fused to underlying muscles or is used for vitamin synthesis doesn’t capture the main function of amphibian skin. So the strongest, most accurate description is that their skin is specialized for respiration and moisture absorption.

Amphibian skin is designed to exchange gases and stay moist to absorb water, which is essential for their survival. The skin is thin and highly vascular, so gases can diffuse directly through it, supplementing the lungs in many species. Keeping the skin moist with mucus is crucial because diffusion happens best when the surface remains wet, and it also allows some water to be absorbed from the environment.

Because of this moist, permeable nature, amphibian skin is not covered in scales—that feature is more typical of reptiles and many fishes. The idea that the skin is fused to underlying muscles or is used for vitamin synthesis doesn’t capture the main function of amphibian skin. So the strongest, most accurate description is that their skin is specialized for respiration and moisture absorption.