Why do most animals have radial or bilateral symmetry?

Most animals exhibit radial or bilateral symmetry as these body plans facilitate movement and interaction with their environment. Radial symmetry allows organisms like jellyfish to sense stimuli from all directions, which is advantageous in a free-floating lifestyle. In contrast, bilateral symmetry enables more streamlined movement and directional control, beneficial for active predators and mobile species. This evolutionary trait enhances survival by improving feeding, locomotion, and reproductive strategies.