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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

User Jeffz
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The correct answer is A. Giant Tortoises

He noticed how they were different on different islands which shows that sometime in history, the islands drifted apart thanks to which the tortoise variants were created based on the island where they were.
User Premchandra Singh
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