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OpenStudy (anonymous):
What observation did Darwin make that suggested there had been geological changes in Earth's history? A. giant tortoises B. fossils of giant sloths C. fossil shells on top of mountains D. an absence of rabbits in South America
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OpenStudy (anonymous):
I believe it was A. giant tortoises.
OpenStudy (shreehari499):
The giant tortoises suggested there had been geological changes in Earth's history accordind to darwin's obs..
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