| 31. | However, some echinoderms have developed bilateral symmetry secondarily.
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| 32. | Reflectional symmetry, linear symmetry, mirror symmetry, mirror-image symmetry, or bilateral symmetry is symmetry with respect to reflection.
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| 33. | Secondary elements are positioned either side of main structures as two wings to maintain overall bilateral symmetry.
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| 34. | The subset of Young's lattice lying below these partitions has both bilateral symmetry and 5-fold rotational symmetry.
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| 35. | Bilateral symmetry is not easily broken.
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| 36. | This results in a bilateral symmetry.
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| 37. | A very important feature in Chinese architecture is its emphasis on articulation and bilateral symmetry, which signifies balance.
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| 38. | This may represent a stage in the evolution of bilateral symmetry " from a presumably radially symmetrical ancestor ."
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| 39. | The surface is folded, and comes out with bilateral symmetry do to the shape of the case or shell.
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| 40. | It is usually around 0.7 centimeters long ( approximately the size of a fingernail ) and has bilateral symmetry.
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