Why are radially symmetrical animals better in water?

Radially symmetrical animals, such as jellyfish and sea anemones, possess a body plan that allows them to interact with their environment equally from all sides, which is advantageous in a fluid medium like water. This symmetry facilitates efficient movement and feeding, as they can easily capture prey and respond to currents from any direction. Additionally, their structure helps distribute forces evenly, enhancing stability and buoyancy in the aquatic environment. Overall, this design optimizes their survival and adaptability in marine ecosystems.