Assertion: jellyfish | /r/CapableOf | use their hydrostatic skeleton
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text: They have limited control over movement, but can use their hydrostatic skeleton to navigate through contraction-pulsations of the bell-like body; some species actively swim most of the time, while others are mostly passive.[citation needed]
text: Despite having limited control over their movement in water, most jellyfishes use their hydrostatic skeleton to create a type of jet propulsion and move around.