state gov UKPSC RO ARO Mock Tests Series 2025 General Knowledge Ecology and Environment Ecology and Functions of an ecosystem

'पारिस्थितिकी तंत्र' शब्द का पहली बार इस्तेमाल 1935 में हुआ था

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टेलर 
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क्लार्क
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तनस्ले
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लिंडेमन
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