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9 total sentences available.
In a radiate body plan, as shown by a star-fish, the body is composed on the principle of converging rays, the antimeres; each of the latter is bilaterally symmetrical, with a distinction between dorsal and ventral, and contains a series of "organs"; and each of these organs has its minor parts.
Source: wiktionary
Each phylum originated from a single founding species, is characterized by a unique body plan or Bauplan (Chapter 6), and had an independent evolutionary history for over 540 to 560 million years according to most current estimates.
Source: wiktionary
If we ascribe all limitation of variation in body plan to the limitations imposed by functional constraints during development and during independent existence, then we have indeed a thoroughgoing "selectionist" or "conditions for existence" account for such stability.
Source: wiktionary
The middle line of the body plan, or fore perpendicular, is drawn square to the base, and the half siding of the stem and stern-post on each side of it.
Source: wiktionary
Showing 4 of 9 available sentences.