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Lamarckism, also known as the theory of inheritance of acquired characteristics, is an early theory of evolution proposed by the French biologist Jean-Baptiste Lamarck in the early 19th century. It attempts to explain how organisms change over time and adapt to their environment. Though largely discredited in modern biology, Lamarckism holds historical importance and has contributed to the development of evolutionary theory. In the context of physical anthropology, Lamarckism is significant for understanding the evolution of human physical traits and behaviors in response to environmental and societal pressures. A critical discussion of Lamarckism involves analyzing its core principles, historical context, scientific validity, impact on anthropology, and how it compares to Darwinian theory. Lamarck's theory is built on two main principles: the *use and disuse* of organs, and the *inheritance of acquired characteristics*. According to the principle of use and disuse, body parts that are used extensively become stronger and more developed, while those that are not used deteriorate over time. The second principle suggests that these changes acquired during an organism’s lifetime can be passed on to its offspring. A classic example often cited is that of the giraffe, where ancestral giraffes are believed to _______ _____ _____ __________ _________ _____ __________ ________ _____.
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