The smallest blood vessels which are one-cell thick, are called ______
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___________ gases absorb long wave (infrared) radiation from the earth and emit it again towards the earth.
Khangchendzonga National Park, also known as Kanchenjunga Biosphere Reserve, is located in ________.
The outermost layer of sun is called
1 km/hr equals _____________ m/s
 Indian Constitution came into force on
Who was the first indian Chief Election Commissioner?
The original 1950 Constitution of India is preserved in _______ ?