Give one example of Lamarck’s theory.
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One example often cited in association with Lamarck's theory of evolution is the giraffe's elongated neck. According to Lamarckian principles, giraffes developed long necks through the inheritance of acquired characteristics, whereby individuals stretched their necks to reach leaves high in trees, and this elongation was passed on to their offspring.
In Lamarck's theory, organisms were believed to have an innate drive to adapt to their environments, and their behaviors or actions could directly influence their traits. Giraffes, in this example, were thought to have continually stretched their necks over successive generations to reach higher foliage, resulting in the elongation of the neck in their descendants.
However, it's important to note that Lamarck's theory of evolution has been largely discredited in modern biology, as it does not align with our current understanding of genetics and inheritance. The mechanism proposed by Lamarck, known as the inheritance of acquired characteristics, has been supplanted by the principles of natural selection and genetic variation elucidated by Charles Darwin and later developments in molecular genetics.