What step in the process shows the inheritance of acquired traits as proposed by Lamarck?

The inheritance of acquired traits, as proposed by Lamarck, is illustrated in the example of a giraffe stretching its neck to reach higher leaves. According to Lamarck, the giraffe would pass on this elongated neck to its offspring, suggesting that traits acquired during an organism's lifetime can be inherited. This idea contrasts with Darwin's theory of natural selection, which focuses on genetic variations that are naturally selected over generations, rather than traits gained through use or effort.