The shells within the test of these creatures are made up of packed, fitted plates which protect them from being damaged.
The spines, outlining their shell, are movable and help to camouflage or protect itself from predators. On the bottom side of a sea urchin there are five teeth that these organisms use to ingest algae and break down other foods they consume to survive.
Hydrogen Kaltlicht [...] / in fünf Minuten / Wein 4. Ettingshausen ©: #Andreas Ritter von Ettingshausen #daguerreotype #fractals A picture of one of Leonardo da Vinci's drawings of the ornamental structure named today 'Flower of Life'. 307v ©: PD = Public Domain; more examples tags: #Leonardo da Vinci #flower of life #fractals Rendition of Homer's view of the world (prior to 900 BC).
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( Lamarck - 'Sea Urchin' (detail) Jean Baptiste (Pierre Antoine) de Monet, Chevalier de Lamarck [1744-1829] Sea urchins are sea creatures that live in oceans all over the world.
Similar to sea stars, sea urchins have a water vascular system.