Final answer:
Radial symmetry in biology involves body parts arranged around a central axis, aiding sea creatures to sense their environment equally.
Explanation:
Radial symmetry is the arrangement of body parts around a central axis, as seen in organisms like jellyfish and sea anemones. It allows these creatures to experience the environment equally from all directions. This type of symmetry is common in animals of phyla Ctenophora and Cnidaria.
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