Both starfish and sea urchins move about on tiny tube feet. These creatures have the same internal structure. Imagine the sea urchin as a starfish rolled up and joined along the edges of its arms.
Picture credit: google
Both starfish and sea urchins move about on tiny tube feet. These creatures have the same internal structure. Imagine the sea urchin as a starfish rolled up and joined along the edges of its arms.
Picture credit: google