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.)

Explain origin of Amphibia and classify Amphibia up to subclass with characters and examples. (UPSC 2020, 15 Marks, ) EN ह function dochangelang(val) { if (val != "") { window.location = val; } }

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