Although both Jean Baptiste Lamarck and Erasmus Darwin had advanced evolutionary theories long before Charles Darwin, such ideas became increasingly controversial and unacceptable in the first decades of the 1800s.

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Lamarck and Erasmus Darwin's theories faced much criticism and opposition in the early 1800s, making them controversial and unacceptable to many. Charles Darwin's theory of evolution by natural selection was not widely accepted until later in the century.

Although Both Jean Baptiste Lamarck and Erasmus Darwin Had Advanced