Biology 29 1 invertebrate evolution

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Biology 29 1 invertebrate evolution

  1. 1. 29-1 Invertebrate Evolution<br />
  2. 2. Radial Symmetry<br />Body plan in which body parts repeat around the center of the body; characteristic of sea anemones and sea stars.<br />
  3. 3. Bilateral Symmetry<br />Body plan in which only a single, imaginary line can divide the body into two equal halves; characteristic of worms, arthropods, and chordates.<br />
  4. 4. cephalization<br />Concentration of sense organs and nerve cells at the front of an animal’s body.<br />
  5. 5. Coelom<br />Fluid-filled body cavity lined with mesoderm<br />
  6. 6. Key Concept<br />All invertebrates except sponges exhibit some type of body symmetry.<br />
  7. 7. Key Concept<br />Invertebrates with cephalization can respond to the environment in more sophisticated ways than can simpler invertebrates.<br />
  8. 8. Key Concept<br />Most complex animal phyla have a true coelom that is lined completely with tissue derived from mesoderm.<br />

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