- two different body forms, polyp (shaped like a vase and usualy sessile
and Medusa (bell-shaped and free-swimming)
- Armlike structures called tenticles, that surround the mouth. The tenticles have
stinging cells that help obtain food
- radial symmetry
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- Contain gondas as their only organs
- movment is corrdinated by the nerve net and receptors
- respiration takes place by diffusion of oxygen directly through their tissues
- digestion takes place in the gastrovascular cavity
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- Cnidarians have one body openings
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- Adult sea anemones are polyps that grow attached to the ocean bottom, a rock, coral, or any surface.
- Jellyfish can perform upward movements but must float to move downward
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