Sponges have a water based circulatory system, a combination of the natural flow of water around and through them, plus a kind of hydrodynamic suction, where a slightly faster flow of water at their top portions sucks water through from the bottom, plus the collective wriggling action of flagellated cells on the surface of their bodies which creates a water current through the pores of the sponge.
Gases dissolved in the water enter and leave the sponge cells by diffusion.
(see the links below for more information.)
No sponges have skeletons.
osteoporosis
different kind of joint
Although sponges do not have a skeletal system they do have skeleton components that may be made of silicon or lime. A sponge is found in the ocean and is a hollow tube that has several large pores throughout it.
It is made for running , hunting or chasing.
shrimp!
The skeletal system are your bones.
skeletal system* bones. :)
the skeletal system is a system in the body .
The skeletal system itself is an organ system. Some schemes combine the skeletal system with the muscular system to make the musculoskeletal system.
Sea sponge
The skeletal muscle works with skeleton by constricting and moving it.The nervous system gives the signal to the muscle and makes it constrict.This would mean that the two that I know of would be the skeletal system and the nervous system