Question
Which class of vertebrates possesses cold-blooded characteristics and scaly skin?
The correct answer is
Reptilia
Vertebrate Class: Cold-Blooded & Scaly Skin Identification
The question asks to identify the class of vertebrates characterized by being cold-blooded (ectothermic) and having scaly skin.
Vertebrate Class Characteristics
- Cold-blooded (Ectothermic): Organisms whose body temperature relies on external sources.
- Scaly Skin: Skin covered in scales, which helps prevent dehydration.
Analyzing Vertebrate Classes
Let's examine the options based on these characteristics:
- Reptilia: Reptiles are ectothermic (cold-blooded) and typically possess dry skin covered in scales. Examples include snakes, lizards, turtles, and crocodiles.
- Mammalia: Mammals are warm-blooded (endothermic) and have skin covered with hair or fur, not scales.
- Aves: Birds are warm-blooded (endothermic) and have feathers, not scales (though some bird feet have scales).
- Amphibia: Amphibians are ectothermic (cold-blooded) but possess moist, permeable skin without scales. Examples include frogs, salamanders, and newts.
Conclusion
Based on the defining characteristics of being cold-blooded and having scaly skin, the correct vertebrate class is Reptilia.
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