Question

Give the common names for the four major kinds of echinoderms. What is similar about echinoderms...

  1. Give the common names for the four major kinds of echinoderms.
  2. What is similar about echinoderms and cnidarians? In what way does echinoderm symmetry differ from that of cnidarians?
  3. What structures are scattered between the spines of a sea star on its dorsal surface?
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The common names for the four major kinds of echinoderms are sea stars, sea urchins, flowery sea lilies and sea cucumbers.

The similar thing about Cnidarians and echinoderms is that they have radial symmetry.

Echinoderms have pentaradial symmetry which is a type of radial symmetry that is characteristic of echinoderms- the body parts are arranged along five rays of symmetry

whereas Cnidarians have radial symmetry- that they have a circular body plan, cut through the center of the animal leaves two equal halves.

Tube feet are small tube-like projections scattered between the spines of a sea star on its dorsal surface

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