MATTHEW OLDFIELD / SCIENCE PHOTO LIBRARY MATTHEW OLDFIELD / SCIENCE PHOTO LIBRARY
Starfish (Fromia sp.) resting on a sponge. A starfish typically has 5 arms radiating outward from a central disc. Tube feet (not seen) located on the undersides of the arms are used for movement. A starfish does not have a brain. Instead, coordination is controlled by one or more rings of centrally-located nerves. Photographed off Mabul, Malaysia.
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