| 41. | Frustrated parents know how much has changed in children's activity levels in a generation.
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| 42. | Sudden change in activity levels may work for a long-term improvement in cardiac health.
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| 43. | *The activity level here seems to have died down.
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| 44. | Habitat variation often leads to changes in activity levels.
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| 45. | Garcia is able to manipulate the firing of an individual cell, controlling its activity level.
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| 46. | His activity level has helped more than anything else.
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| 47. | That activity level is either too high for children or too high for mature adults.
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| 48. | Stick them in a back bedroom where the noise and activity level are less disturbing.
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| 49. | The English Wikipedia has administrators ( see or lists of administrators by activity level ).
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| 50. | Activity levels decrease as girls enter their teenage years.
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