ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY
Starfish (class Asteroidea). Starfish typically have five arms radiating outward from a central disc, where its mouth opens towards the bottom. Tube feet located on the undersides of the arms are used for movement. Starfish do not have a brain. Instead, coordination is controlled by one or more rings of nerves that surround the oesophagus. Photographed in the Caribbean Sea off the coast of the Bahamas.
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