What type of body symmetry do Cnidarians exhibit?

Cnidarians exhibit radial symmetry, which is a key characteristic of this group of organisms. Radial symmetry means that the body plan can be divided into similar halves by multiple planes that pass through a central axis. This allows for an equal distribution of sensory structures and tentacles around the body, enabling Cnidarians, such as jellyfish, corals, and sea anemones, to interact with their environment from all directions.

This type of symmetry is advantageous for organisms that are primarily sessile (fixed in one place) or free-floating, as it allows them to capture prey and respond to environmental stimuli effectively without a front or back orientation. In contrast, bilateral symmetry is characterized by a distinct left and right side and is typical of animals that move in a specific direction, like most vertebrates. Asymmetry would imply a lack of any symmetry, which is not applicable in the context of Cnidarians. Segmented symmetry refers to a body plan divided into repeatable sections, which Cnidarians do not possess, as their structure is not segmented like that of annelids or arthropods.