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Which class of vertebrates possesses dry...

Which class of vertebrates possesses dry and cornified skin with epidermal scales or scutes?

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To answer the question "Which class of vertebrates possesses dry and cornified skin with epidermal scales or scutes?", we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Characteristics**: The question specifies "dry and cornified skin" along with "epidermal scales or scutes". We need to focus on these characteristics to determine the correct class of vertebrates. 2. **Understand the Types of Vertebrates**: The main classes of vertebrates include: - Pisces (fish) - Amphibia (amphibians) - Reptilia (reptiles) - Aves (birds) - Mammalia (mammals) 3. **Examine the Skin Structure**: - **Pisces (Fish)**: Fish have scales that are dermal in origin, meaning they arise from the dermis layer of skin. They do not possess dry skin; instead, their skin is moist and covered in mucus. - **Amphibia (Amphibians)**: Amphibians also have moist skin and do not have cornified skin or epidermal scales. - **Reptilia (Reptiles)**: Reptiles have dry and cornified skin. Their scales are epidermal in origin, made primarily of keratin. This class includes animals like lizards, snakes, turtles, and crocodiles. - **Aves (Birds)**: Birds have feathers, not scales, and their skin is not typically described as cornified in the same way as reptiles. - **Mammalia (Mammals)**: Mammals have fur or hair, and their skin does not have scales. 4. **Conclusion**: Based on the characteristics of the skin and the type of scales present, we can conclude that the class of vertebrates that possesses dry and cornified skin with epidermal scales or scutes is **Reptilia**. ### Final Answer: The class of vertebrates that possesses dry and cornified skin with epidermal scales or scutes is **Reptilia**. ---
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