Lamarck's theory, also known as Lamarckism or the inheritance of acquired characteristics, posits that physical changes an organism undergoes during its lifetime—such as the development of an organ through increased use or its weakening through disuse—can be passed directly to its offspring. He famously used the example of giraffes stretching their necks to reach high leaves, suggesting this stretching resulted in longer necks that were then inherited by the next generation.
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