engineering recuitment DRDO CEPTAM STA B Tier I (Sr. Technical Assistant) Mock Test 2022 General Knowledge Ecology and Environment Ecology and Functions of an ecosystem

पृथ्वी का सबसे बड़ा पारिस्थितिक तंत्र है: 

1
जीवमंडल
2
जलमण्डल
3
स्थलमंडल
4
बायोम
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