<span>Chemosynthesis is the answer</span>
Well to move they need help from the muscles, because by their own they are just like a bunch of sticks
Pulmonary circulation is the type of circulation that explains the movement of blood from the heart to the lungs and back to the heart again.
Blood that does not carry oxygen originates from the heart and moves to the lungs where it is filled with oxygen. Oxygen filled blood from the lungs travels back to the heart where the oxygen is used up.