Bilateral Symmetry
Any organism or device having symmetry along only a single axis (left and right), in contrast to radial or spherical symmetry. Motile organisms in environments that have an 'up' and 'down' direction tend to develop bilateral symmetry. Many terragen and exobiological animal phyla are bilaterally symmetrical.
 
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Development Notes
Text by M. Alan Kazlev and Stephen Inniss

Initially published on 08 October 2001.