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Lamarckism, a theory of evolution based on the principle that physical changes in organisms during their lifetime—such as greater development of an organ or a part through increased use—could be transmitted to their offspring.

The best describes the role of Lamarck's ideas in the development of Darwin's theory of evolution is the inheritance of acquired characters.

What is Darwin's theory of evolution or Darwinism?

Darwin's theory of evolution completely depends on natural selection. It gives the idea of descent with modifications. According to this theory, the evolution of new species takes place due to cladogenesis.

Lamarck's postulate of inheritance of acquired characters states that organisms acquire characters are get inherited into the next generation. And due to this, the body complexity has increased during the course of evolution.

Therefore, the best role of Lamarck's ideas in the development of Darwin's theory of evolution is the inheritance of acquired characters.

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