11. The radial symmetry is characteristic of echinoids generally, including the ancestors of sand dollars. 12. One branch developed into strangely dorsoventrally flattened forms with partial radial symmetry and metallic exoskeletons. 13. Note radial symmetry due to simple diffusion. 14. The bodies of adult sand dollars, like those of other echinoids, display radial symmetry . 15. The term ogee is used due to the ogee shape in radial symmetry around the centre. 16. The radial symmetry of each flower is five-fold, with the flowers usually bisexual, rarely unisexual. 17. Native life on Sergyar seems to have a general radial symmetry , with most lifeforms having six limbs or appendages. 18. Each flowering head of " B . alba ", which is small, appears in radial symmetry . 19. Because of its inherent limitations, throwing can only be used to create wares with radial symmetry on a vertical axis. 20. See the figure, in which time is running vertically and we use the radial symmetry to suppress one spatial dimension.
