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
C. fossil shells on top of mountainsAt the Cape Verde islands Darwin saw a geological band of seashell sediments far above the current sea level, yet covered by a layer of lava from volcanoes that had been inactive for all of known history
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