Yogyatam Ka Uttarjeevita Sidhhant Kisne Diya ? योग्यतम का उत्तरजीविता सिद्धांत किसने दिया ?
योग्यतम का उत्तरजीविता सिद्धांत किसने दिया ?
हर्बर्ट स्पेंसर
Comments hemraj parmar on 08-02-2017 Renu Sharma on 08-02-2017
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Nikita Golhani on 07-02-2017
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