| 31. | A basal trait is the coarse serration.
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| 32. | Human uses of serration have copied, and gone beyond, those found in nature.
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| 33. | Seedling leaves are much more delicate and a lighter green with serrations along the edge.
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| 34. | The sickle blades feature fairly uniform serrations, which made the harvesting of grain easier.
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| 35. | The reason for this being most of the cutting takes place in the serrations themselves.
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| 36. | They grow up to 30cm wide and the margins are entire ( no serration ).
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| 37. | The point of the leaf base to the first serration is almost a straight line.
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| 38. | This would then be torn off, using the serrations incorporated into the top cover.
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| 39. | Stealth airframes sometimes display distinctive serrations on some exposed edges, such as the engine ports.
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| 40. | Both the jaws and the mandibles have sharp hooks and serrations to hold on to prey.
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