A complex creature. Regular underwater photography, magnified close-ups, and film through a microscope present sea urchins. We see their mouth and five teeth close and open. After injecting ... Read allA complex creature. Regular underwater photography, magnified close-ups, and film through a microscope present sea urchins. We see their mouth and five teeth close and open. After injecting one with gelatin, the shell is removed and we see the muscle structure, digestive tube, an... Read allA complex creature. Regular underwater photography, magnified close-ups, and film through a microscope present sea urchins. We see their mouth and five teeth close and open. After injecting one with gelatin, the shell is removed and we see the muscle structure, digestive tube, and reproductive organs. Magnified stems reveal suction cups; stems lengthen and contract al... Read all
