Teaching Bihar STET Paper 1 (माध्यमिक) Mock Test 2024 General Knowledge Ecology and Environment Ecology and Functions of an ecosystem

'पारिस्थितिकी' शब्द किसके द्वारा पेश किया गया था?

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अर्न्स्ट हेकेल
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ई.पी. ओडुम
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ए.जी. टांसले
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रामदेव मिश्रा
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