Darwin's evolutionary theory differs from Lamarck's in being a variational rather than transformational theory.

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Darwin's theory proposes that traits in a population vary and that some variations may provide a selective advantage, leading to the survival and reproduction of individuals with these advantageous traits. In contrast, Lamarck's theory suggested that individuals can acquire characteristics throughout their lifetime and pass them on to their offspring, leading to a transformation of species over time. Thus, Darwin's theory is variational in nature, while Lamarck's theory is transformational.

Darwin's Evolutionary Theory Differs from Lamarck's in Being a Variational