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Look in your textbook, search the Internet or go to the Library. Use these keywords or concepts to start your search:

• Cloaca
• Diffusion
• Filtration
• Gills
• Gut
• Nasal glands
• Osmotic concentration
• pH
• Secretion
• Selective reabsorption

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© 2004, Arthur L. Buikema, Jr., All rights reserved.