A balloon filled with water.
They are supported by their hydroskeleton.
Hydroskeleton
hydroskeleton
A hydroskeleton works by using fluid-filled cavities surrounded by muscles to create support and movement. When the muscles contract, they apply pressure to the fluid, causing the structure to stiffen and move, providing support for the organism. This system is commonly seen in invertebrates like jellyfish and earthworms.
In a hydroskeleton, muscles are arranged in concentric layers around a fluid-filled cavity. Contraction of these muscles causes movement by changing the pressure of the fluid inside the cavity, similar to a hydraulic system. This arrangement provides structure and support while allowing for flexibility and movement.
The examples are tire ,ballon ,and beachball and the non-examples are shoe,chair,and bed
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