How did Charles Darwin later explain natural relationships among organisms differently from Carolus Linnaeus?

While Carolus Linnaeus established the foundational system of classification by grouping organisms into nested sets based on shared morphological features, his system did not explain why these organisms were similar. Linnaeus believed that species were similar in form because they were created by God as distinct, unchanging entities.12

Charles Darwin provided a transformative explanation for these natural relationships in his Origin of Species (1859). He proposed that the similarity between organisms is the result of common descent. Under this framework, the taxa in the Linnaean system represent groups of organisms with shared ancestral histories; the more specific the taxon, the more closely related the organisms are through evolution.12

Consequently, while Linnaeus viewed his hierarchy as a set of discrete, divinely created classes, Darwin’s theory shifted the scientific understanding of these relationships toward a phylogenetic tree, where biological classification reflects the actual evolutionary history of life.32