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An Introduction to the World's Oceans, 10/e
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The Living Ocean

Internet Exercises
Under the "Environments" and "Organisms" headings, click on each "Sunlit Zone" link. How do the physical challenges of organisms living in the rocky intertidal zone differ from those living in the kelp beds?
What are some of the adaptations of organisms living in the twilight zone? What term is applied to this depth range within the ocean by the class text?
Biodiversity is a measure of the variety of life found within a region or the world as a whole. Use the link to the website listed above to explore questions about marine biodiversity. What is a phyla? What fraction of known phyla are found living within the sea? How well is marine biodiversity understood compared to terrestrial biodiversity? Which regions of the ocean are believed to hold the greatest biodiversity?