Chapter 30 - respiratory systems and most have only a...

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Chapter 30: Deuterostomes: Vertebrates and their Closest Relatives Echinoderms o Secondary radial symmetry and an internal skeleton o Develop from a bilaterally symmetrical, free-swimming larva. As a larva develops, it assumes a secondary radial symmetry, often organized around five rays or “arms” o Well-defined coelom and a complete digestive system, but no excretory or
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Unformatted text preview: respiratory systems, and most have only a minimal circulatory system. o Given their radial symmetry, there is no head or central brain; the nervous system is organized around nerve cords that encircle the mouth and branch into the rays. o Produce by releasing gametes into the water. o Produce asexually too: splitting in half and regenerating the missing parts o...
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