| 11. | This they did in a draft of male citizens assembled by age class.
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| 12. | It suddenly found it couldn't afford Kalvin's small, multi-age class.
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| 13. | The dominant age classes were affected by the environmental conditions.
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| 14. | In a Leslie model, the population is divided into groups based on age classes.
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| 15. | Beetles were taken by all other age classes of chicks, but in smaller amounts.
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| 16. | In small, multi-age classes, children are nurtured as curious, creative, and compassionate world citizens.
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| 17. | "I wanted all plumages, age classes and sexes, of all species, " he said.
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| 18. | Brown and Zeng calculated an annual death rate of 0.35 for all age classes.
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| 19. | Contemporary teaching and learning materials are developed for multi-age classes.
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| 20. | He has taught University of the Third Age classes since his retirement from full-time teaching.
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