| 31. | The stability is explained by the purifying / stabilizing selection of body plans and the constructional restictions.
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| 32. | "The Logic of Building the Body Plan"
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| 33. | Cuvier grouped these diverse phyla together according to the common structural feature : the segmented body plan.
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| 34. | The colonisation of new niches resulted in diversification of body plans and sometimes an increase in size.
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| 35. | Segmentation of the body plan is important for allowing free movement and development of certain body parts.
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| 36. | Even mammals, including humans, show the segmented bilaterian body plan at the level of the nervous system.
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| 37. | The body plans of most multicellular organisms exhibit some form of symmetry, whether radial, bilateral, or spherical.
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| 38. | Like that of the spider order, the Araneae, the body plan of the Solifugae has two main webs.
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| 39. | Thus the Cambrian explosion appears to have more or less completely replaced the earlier range of body plans.
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| 40. | Simple rules are constraints that early on give rise to basic body plans and then to complex additions.
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