Explain origin of Amphibia and classify Amphibia up to subclass with characters and examples. (UPSC 2020, 15 Marks, )

उभयचर की उत्पत्ति की व्याख्या करें और उभयचर को उपवर्ग तक उनके लक्षणों और उदाहरणों के साथ वर्गीकृत करें। (Explain origin of Amphibia and classify Amphibia up to subclass with characters and examples.)
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Lungs of amphibians and mammals. (UPSC 2003, 20 Marks, )

उभयचर और स्तनधारियों के फेफड़े। (Lungs of amphibians and mammals.)
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Amphibian and mammalian vertebrae. (UPSC 2001, 20 Marks, )

उभयचर और स्तनधारी कशेरुक। (Amphibian and mammalian vertebrae.)
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Write an essay on the fossil records of amphibians to explain their origin and evolution. (UPSC 2000, 60 Marks, )

उभयचरों के जीवाश्म अभिलेखों पर एक निबंध लिखें ताकि उनके उत्पत्ति और विकास को समझाया जा सके। (Write an essay on the fossil records of amphibians to explain their origin and evolution.)
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Introduction
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