| 31. | The epidermis is the most superficial layer of skin, a stratum basale.
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| 32. | The " stratum basale " is a continuous layer of cells.
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| 33. | From each stratum, three random regions were chosen for the pilot project.
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| 34. | The lateral variation in sediment within a stratum is known as sedimentary facies.
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| 35. | The stratum is cemented with clay and calcium carbonate.
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| 36. | The conceptual stratum also contains ideas about how concepts relate to each other.
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| 37. | Central Avenue crosses every economic stratum in Phoenix, rather abruptly in places.
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| 38. | The stratum beneath the surface consists of glacial gravel.
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| 39. | He's a reflexive snob, like everyone else in his social stratum.
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| 40. | As always, Primakov expresses the position of a whole stratum of the elite.
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