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Answer:
all of these are echinoderms
The shallow shoulder socket makes the joint unstable, which makes the bone easy to dislocate.
Plate tectonics and the ocean floor. ... Where plates are pulled away (diverge) from each other molten magma flows upward between the plates forming mid-ocean ridges, underwater volcanoes, hydrothermal vents, and new ocean floor crust. The Mid-Atlantic Ridge, is an example of this type of plate boundary.