Concept explainers
Scientists have found a number of fos-
sil turtles. One early fossil turtle did
not have a “shell” but did have wide,
expanded ribs along its back (“top”) side
and expanded belly coverings on the
belly (“bottom”) side. A second, more
recent turtle fossil had a full bottom shell.
Although this second fossil turtle did not have a full top
shell, it did have a partial shell extending from its backbone
as well as wide, expanded ribs. What do these two fossils tell
us about turtle evolution? Does it support the hypothesis
that turtles evolved in water rather than on land? ( Hint: If
the bottom shell evolved first, what kinds of predators did it
help defend turtles from?) Explain your answer.
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Check out a sample textbook solutionChapter 17 Solutions
Modified Mastering Physics with Pearson eText -- Standalone Access Card -- for Conceptual Integrated Science
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