Darwin's concept of the struggle for existence was inspired by the essay on population written by
- A. Thomas Malthus
- B. Herbert Spencer
- C. Charles Lyell
- D. Alfred Wallace
Explanation
Malthus argued that human populations grow faster than food supply, and Darwin saw the same pressure in nature: far more offspring are born than can survive. Lyell's geology shaped Darwin's timescale, but the struggle came from Malthus.
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