Echinoderms have radial symmetry, which means they are divided into 5 equal sections, radiating from a central point. In each segment, there is an identical set of internal organs. The closest thing to eyes in the phylum is the light sensitive spots on their arms. Along with having no eyes, Echinoderms also have no heart or brain. Each tentacle-like structure is called a tube foot and aids in respiration and movement. Echinoderms are coelomates, which means they have a large body cavity completely lined with tissue.
No comments:
Post a Comment