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Additionally, two groups of cnidarians, corals and sea anemones, exhibit six-or eight-fold symmetry. These types of symmetry are referred to as hexamerism and octamerism, respectively. It should be noted that cnidarians are not the only animals to exhibit radial symmetry.
There are three types of symmetry in biology: Radial, bilateral, and asymmetry. Your son's teacher is most likely only concerned with the first two. Humans have bilateral symmetry. You can divide them into two equal parts.Starfish have radial symmetry.arthworms may appear to have radial symmetry because of their cylindrical shape, but DON'T BE FOOLED! They actually have BILATERAL symmetry. This is because they have an up and down (dorsal and ventral), and front and back (andterior and posterior). Linus Â· 9 years ago. Thumbs up.