Most organisms exhibit bilateral symmetry, where the body can be divided into two equal halves along a single plane. This form of symmetry is common in animals, such as humans, dogs, and insects, facilitating streamlined movement and efficient body organization. Bilateral symmetry is associated with cephalization, where sensory and neural organs are concentrated at the anterior end, enhancing an organism's ability to interact with its environment. This symmetry plays a key role in evolutionary trends within the animal kingdom.