SYMMETRY


 * Symmetry is the correspondence which exists in the body of some living things in relation to a centre, an axis or a plane.
 * The body of an animal can exhibit bilateral symmetry, radial symmetry or not be symmetrical at all.
 * Asymmetry: When the body can not be divided into similar sections. e.g. porifera.[[image:http://www.chs.helena.k12.mt.us/faculty/hbosch/Invertebrates/sponges_files/image001.gif width="208" height="234"]][[image:http://2.bp.blogspot.com/-3vonsfiMO-E/Tn_WoHORaQI/AAAAAAAAAEA/GtR1js5RZtE/s1600/symmetry.jpg width="478" height="194"]][[image:http://facweb.furman.edu/%7Ewworthen/bio111/anima4.jpg width="382" height="307"]]
 * Bilateral symmetry: The animal can be divided into equal halves along a single plane (right and left sides that are mirror images) e.g. Worms, Arthropods, Molluscs and all vertebrates.
 * Radial symmetry: The body parts are arranged around a central point like wheels e.g. Cnidaria, Eqchinoderms