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While browsing through dinosaur books in a local used-book store, you notice a recurring theme in many illustrations from older books. The largest dinosaurs are shown submerged in water, with only their long necks and perhaps shoulders above the water surface. You recall reading in more recent books that these same dinosaurs were land dwellers. You also remember that their long necks were supposedly more adapted for eating leaves from the tops of tall trees, than as "periscopes" for an aquatic lifestyle. You look through more books and see illustrations of these same dinosaurs sitting back on their hind legs, reaching for the higher parts of trees.

What evidence supports land being the habitat for these dinosaurs? And why were their necks so long in comparison to other dinosaurs? What evidence supports that their neck length was related to tree heights? Does any evidence support that they ate vegetation from the tops of trees or that they sat on their hind legs to reach it?

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