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| the double membrane surrounding the nucleus within a cell |
| variation in traits such as body weight or height in which a series of types are distributed on a continuum, not grouped into discrete categories |
| radial symmetry | |
| —n | |
| Compare bilateral symmetry a type of structure of an organism or part of an organism in which a vertical cut through the axis in any of two or more planes produces two halves that are mirror images of each other | |
| radial symmetry
Symmetrical arrangement of parts of an organism around a single main axis, so that the organism can be divided into similar halves by any plane that contains the main axis. The body plans of echinoderms, ctenophores, cnidarians, and many sponges and sea anemones show radial symmetry. Compare bilateral symmetry. |