Most living organisms exhibit bilateral symmetry, a type of symmetry where the body can be divided into two identical halves along a single plane. This symmetry is common in animals, including humans, as it allows for more efficient movement and organization of body structures. In contrast, radial symmetry is found in organisms like jellyfish and starfish, where the body parts are arranged around a central axis. Bilateral symmetry plays a crucial role in evolutionary biology by influencing the development and function of organisms.