Final answer:
The Galapagos Turtles and mainland turtles developed differences due to environmental factors and chance events.
Step-by-step explanation:
The Galapagos Turtles and mainland turtles shared a common ancestor, but they developed differences over time due to environmental factors and chance events. The Galapagos Islands have unique environmental conditions, such as different food sources and varying temperatures, which led to adaptations in the Galapagos Turtles. Additionally, the isolation of the Galapagos Islands allowed for genetic drift and the accumulation of genetic variations that resulted in distinct characteristics in the Galapagos Turtles.
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