Q- Differentiate the nature of skin in four classes of Tetrapoda.
Answer- The four main classes of Tetrapods are as follows with nature of their their skin:
1. Reptilia: The skin of reptiles are dry, non-glandular and is covered with scales.
2. Amphibia: The skin of amphibians is thin, moist, glandular and respiratory (respiratory means that helps in respiration).
3. Aves: The skins of aves are dry and non-glandular. The skin of aves is covered with features.
4. Mammalia: Mammals have a glandular skin with hair on it.