Final answer:
Charles Lyell influenced Darwin with the concept of gradual geological change over long periods of time.
Explanation:
Charles Lyell, a geologist and friend of Charles Darwin, influenced Darwin's thinking with the idea that geological forces shaping the earth happen over long periods of time with predictable uniformity. Lyell's concept of gradual geological change and the greater age of the Earth provided a framework for Darwin's theory of gradual species development. This influence contributed to Darwin's principle of natural selection and evolution.
Learn more about Charles Lyell's influence on Darwin's thinking in biology here:
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