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Nitrogen gas
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Carbon dioxide
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Oxygen
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Hydrogen
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Pedology
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Pedagogy
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sociology
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Demography
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Snake
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Turtle
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Lizard
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Crocodile
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Cat
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Lizard
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Snake
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None of these
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Rain
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Snow
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Smog
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None of these
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Knowledge
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Clouds
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Rain
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None
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Refraction
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Light scattering
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Reflection
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Interference
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Reflection
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Total internal reflection
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Refraction
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None of these
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16-30
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15-20
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5?10
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6?12
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Cellular
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Organismic
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Both of these
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None of these
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Disphragm
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Pleura
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Pericardium
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Rib cage
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Organismic
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Cellular
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Both of these
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None of these