The skin of amphibians isA     dry and scalyB     dry and scalelessC     moist and scalyD     moist and scaleless

To answer this question, we need to understand the characteristics of amphibian skin. Amphibians, such as frogs, toads, and salamanders, possess unique skin properties that distinguish them from other groups of animals.

1. Amphibian skin is typically moist because it plays a crucial role in respiration and moisture absorption. This moisture is essential for their survival as it allows gases to diffuse through the skin.

2. Amphibians do not have scales. Instead, their skin is smooth and enables efficient gas exchange. This lack of scales helps them to maintain hydration in their often terrestrial environments.

Given these characteristics, the correct answer to the question about the skin of amphibians is:

D: moist and scaleless.

This option accurately reflects the anatomical and physiological traits of amphibians and emphasizes their dependency on moist environments for their biology.