What are the conditions required for formation of corals and what are the causes for their decline worldwide?

GS PAPER I

वनस्पति एवं प्राणीजगत में परिवर्तन और इस प्रकार के परिवर्तनों के प्रभाव।

Corals  के बनने  के लिए क्या जरूरी कारक होने चाहिए  और दुनिया भर में उनकी गिरावट के क्या कारण हैं?

What are the conditions required for formation of corals and what are the causes for their decline worldwide?

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