Which organism is most likely going to have a hydrostatic skeleton?

Name: Which organism is most likely going to have a hydrostatic skeleton?
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A hydrostatic skeleton offers support and resistance to the contraction of muscles so that an animal can move.In animals that lack a hard skeleton,a fluid-filled gastrovascular cavity or a fluid-filled coelom can act as a hydrostatic skeleton.Hydras and flatworms (planarians)use their fluid-filled gastrovascular cavity as a hydrostatic skeleton.

Which Organism Is Most Likely Going to Have a Hydrostatic