An endoskeleton of calcified cartilage
<span> It is a hydraulic </span>system<span> used by echinoderms, such as sea stars and sea urchins, for locomotion, food and waste transportation, and respiration. The </span>system<span> is composed of canals connecting numerous tube feet.</span>
Answer:
what is the question
Explanation:
tell we we will solve it within minutes
My Answer: RNA molecules
Why?: " <span>Catalysts with this special self-promoting property can use raw materials to reproduce themselves and thereby divert these same materials from the production of other substances."
Hope I helped! :D</span>
