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A hydrostatic skeleton is a type of skeleton many animals in the animal kingdom have.
well theres not a type that ALL animals have, they can either have an ecto or endo
Sternum
Sternum
You humans!
They have a type of skeleton called a hydrostatic skeleton. This type of skeleton is a fluid filled sac which is surrounded by muscles.
Internal Skeleton
a sponge skeleton
internal skeleton
it doesn't have a skeleton
The boney kind.
worm