Differentiate between primary and secondary succession. Explain the various steps involved in primary community succession. (UPSC 2019, 10 Marks, )

प्राथमिक और द्वितीयक अनुक्रमण के बीच अंतर करें। प्राथमिक समुदाय अनुक्रमण में शामिल विभिन्न चरणों की व्याख्या करें। (Differentiate between primary and secondary succession. Explain the various steps involved in primary community succession.)