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Day/night come from Earth's rotation on its axis.
Hence the keyed answer is Earth rotation around its axis.
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It reaches up to the base of the stratosphere.
Hence the keyed answer is Stratosphere.
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They are protons, neutrons and electrons.
So the correct answer is Protons,Neutrons & Electrons.
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The ultra-black black dragonfish absorbs nearly all light.
Hence the keyed answer is Black Dragon fish.
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Pulsars emit beams of radio waves detectable from Earth.
So the correct answer is Radio waves detectable from Earth.
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A tokamak magnetically confines plasma for nuclear-fusion research.
Hence the keyed answer is A device used in nuclear-fusion research for magnetic confinement of plasma.
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