Which characteristic is shared by all mollusks and echinoderms? O live only in salt water
O lack a backbone
O use tube feet to move
O have an open circulatory system

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They share lack of back bone, use tube feet to move, and I’m not sure about the open circulatory system because mollusks that fall into cephalopod category have closed ones but all others have open as well as echinoderms

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