'इकोलॉजी' शब्द का प्रयोग सर्वप्रथम किसने किया?
Aदीपंकर सेनगुप्ता
Bअर्न्स्ट हेकेल
Cकार्ल मार्क्स
Dएडम स्मिथ
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