Symmetry in biology | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-30

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Symmetry_in_biology


00:00:54 1 Radial symmetry
00:02:38 1.1 Special forms of radial symmetry
00:04:10 2 Spherical symmetry
00:04:36 3 Bilateral symmetry
00:07:28 4 Biradial symmetry
00:08:04 5 Asymmetry
00:09:03 6 See also
00:09:12 6.1 Biological structures
00:09:50 6.2 Terms of orientation



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SUMMARY
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Symmetry in biology is the balanced distribution of duplicate body parts or shapes within the body of an organism. In nature and biology, symmetry is always approximate. For example, plant leaves – while considered symmetrical – rarely match up exactly when folded in half. Symmetry creates a class of  patterns in nature, where the near-repetition of the pattern element is by reflection or rotation.
The body plans of most multicellular organisms exhibit some form of symmetry, whether radial, bilateral, or spherical. A small minority, notably among the sponges, exhibit no symmetry (i.e., are asymmetric). Symmetry was once important in animal taxonomy; the Radiata, animals with radial symmetry, formed one of the four branches of Georges Cuvier's classification of the animal kingdom.