What is biradial symmetry?

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).