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Biology 26.2
Biology 26.2
Biology 26.2
Biology 26.2
Biology 26.2
Biology 26.2
Biology 26.2
Biology 26.2
Biology 26.2
Biology 26.2
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Biology 26.2

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  • 1. 26.2 Sponges
  • 2. Choanocyte• Specialized cell in sponges that uses a flagellum to move a steady current of water through the sponge.
  • 3. osculum• Large hole at the top of the sponge through which water leaves the sponge
  • 4. Spicule• Spike-shaped structure that makes up the skeletons of harder sponges; made of either calcium carbonate or silica.
  • 5. Archaeocyte• Specialized cell in a sponge that makes spicules
  • 6. Internal fertilization• Process in which eggs are fertilized inside the female’s body.
  • 7. larva• Immature stage of an organism that looks different from the adult form.
  • 8. Gemmule• Group of archaeocytes surrounded by a tough layer of spicules; produced by some sponges.
  • 9. Key Concept• Sponges are classified as animals because they are mulitcellular; heterotrophic, have no cell walls, and contain a few specialized cells.
  • 10. Key Concept• The movement of water through the sponge provides a simple mechanism for feeding, respiration, circulation, and excretion.

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