Most invertebrates/bone-lacking animals live underwater. So they do not need bones for support. Instead they just make rippling wave-like movements to move along with the current of the water.
Land-animals with no bones, such as insects, have an exoskeleton.
Snails do not have any bones in their body, so they have no joints. Their entire body lacks any sort of support structure, which is why they grow their shells.
She relied on her friends for social support during a difficult time in her life.
Earthworms
The octopus completely lacks any bones in its body.
THE BRONCHIOLES
The pellicle provides additional structure and support that a cell membrane lacks. The pellicle also provides an attachment site for external organelles used for motility, food capture or defense such as cilia, flagella, or trichocysts.
Plant cells
One vertebrate that lacks a bony spine is the shark. Many different types of shark have cartilage instead of bones.
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A Mitochondrion
An Edentate is an animal that lacks teeth. (This includes humans of course!!)
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