| 31. | Its present-day length is 52 kilometres.
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| 32. | Ranger School was reduced to its current 61-day length of training, at 19.6 hours of training per day.
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| 33. | The gametophyte phase only produces gametes when day length is long; with shorter days these too reproduce asexually.
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| 34. | In equatorial climes, the change in seasons is not always perceptible and thus, changes in day length not remarkable.
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| 35. | This reproductive diapause is a result of shortening day lengths during larval development and seasonal variation in lipid levels.
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| 36. | Birds also are sensitive to day length, and this awareness is especially important as a cue for migratory species.
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| 37. | The northern extension to Ferris was later added on April 1, 1948, bringing FM 660 to its present-day length.
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| 38. | In addition to the required day length, monarchs in diapause must also have temperatures that promote the formation of eggs.
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| 39. | The contemporary industrialized world, which blazes with artificial illumination, has suppressed men's ability to react to changes in day length.
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| 40. | Flower production is related to increasing day length, and in general, plants produced the most flowers from December to March.
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