Coelenterates, also known as cnidarians, are a group of animals that include jellyfish, corals, and sea anemones. One of their primitive features is radial symmetry, meaning that their bodies are organized around a central axis, like the spokes of a wheel.
Radial symmetry is a characteristic of simple, primitive body plans, and it allows coelenterates to respond to stimuli from all directions.
The other options are not correct:
A. Dorsal mouth: Coelenterates have a mouth surrounded by tentacles, but it's not necessarily dorsal (on the back).
C. Bilateral symmetry: This is a more advanced body plan, where the body can be divided into left and right halves. Coelenterates do not have bilateral symmetry.
D. A false foot: This is a characteristic of some other animal groups, like mollusks, but not coelenterates.
There is an explanation video available below.
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