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Porphyrin
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Vitamin
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Ocular circle
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Stratified
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Radial velocity
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Gamma ray
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Marine energy
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Elementary step
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Telepoint
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Small Magellanic cloud
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Reversible
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Terminator
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Homo heidelbergensis
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Tarsus
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Antihypertensive
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Resveratrol
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Hemicordulia atrovirens
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Android
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Ketose
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Crenellation
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THX
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i-mode
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Weaning
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Karstology
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Catheter
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Epstein-Barr virus
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Acini
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RADARSAT-1
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Bhopal disaster
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Reducing agent
Tropopause
The tropopause is a thin layer in the Earth's atmosphere separating the troposphere from the stratosphere. It is in the tropopause that the coldest air temperatures occur.
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