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Universal time
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Pioneer species
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Apparent movement
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Polysynthetic
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Tertiary
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Puncture
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Periphyton
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Special protection area
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Cuneiform
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Mimosa
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Dense Plume
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Replicase
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Laterite
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Alkaline
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Configuration
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Randomised study
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Dyskinesia
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Radiosensitive
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GTP
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MIME
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Turgidity
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Dwarf star
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Pink moon
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Porphyroblast
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Dolomitic limestone
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Intumescent
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Non-spectral colour
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IUCN
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Dermatologist
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Concentration
pH
Hydrogen potential. pH is an index measuring the hydrogen ion activity in a solution. It is an indicator of the acidity (pH lower than 7) or alkalinity (pH higher than 7) of a solution.
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