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Practice #14,943
Q
एक विशेष भू-भौगोलिक क्षेत्र में विभिन्न प्रजातियों के विकास का प्रक्रम एक बिंदु से शुरू होकर अन्य भू-भौगोलिक क्षेत्रों तक प्रसारित होता है। इस घटना को क्या कहते हैं?
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