Which of the following probably influenced Darwin the most when he was developing his theory of evolution?

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Uniformitarianism, the concept that the same natural laws and processes that operate in the universe now have always operated in the universe in the past and apply everywhere, significantly influenced Darwin. This principle, particularly as articulated by Charles Lyell in "Principles of Geology," suggested that the Earth was much older than previously thought and that slow, gradual processes could lead to significant changes over time. This idea directly influenced Darwin's thinking about natural selection and the gradual evolution of species.

Which of the Following Probably Influenced Darwin the Most When