defence exam Navy SSR (Medical) Mock Test Series 2025 Biology Ecology and Environment Ecosystem

पारिस्थितिकी तंत्र शब्द सर्वप्रथम किसने गढ़ा था?

1
ओडम
2
राईटर
3
टांसले
4
दोनों (2) और (3)
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