രക്ത പര്യയന വ്യവസ്ഥ കണ്ടെത്തിയത് ?
Aവില്ല്യം ഹാർവി
Bഹംഫ്രി ഡേവി
Cകാൾലാൻഡ് സ്റ്റീനർ
Dജോസഫ് പ്രീസ്റ്റ് ലി
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