The observation that the Galápagos tortoises did not all live in the same environment helped Darwin: A. develop his theory of adaptation.
B. develop his theory of evolution.
C. observe mimicry in nature.
D. practice artificial selection.
The observation that the Galápagos tortoises did not all live in the same environment helped Darwin:
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The correct answer is A. develop his theory of adaptation.
Explanation: The Galápagos tortoises exhibited various adaptations to their environments, such as differences in shell shape and size depending on the vegetation available on different islands. These observations were crucial for Darwin as they illustrated how species could adapt to their specific habitats, contributing to his understanding of adaptation in the context of natural selection.