• A unifying Darwinian framework links variation, heritable differences, and selection as engines of change, applied across domesticated and wild taxa to explain adaptation and phylogeny [7], [8], [14], [16].

• Human evolution becomes a central testbed for theory, with repeated analyses of sexual selection, mating behavior, gender roles, and social adaptations shaping humanity's evolutionary path [1], [2], [4], [5].

• Taxonomy and morphology provide the data backbone, showcasing classification schemes, anatomical characters, and systematic comparisons as routes to understand evolutionary relationships [8], [9], [10], [12], [15].

• Behavioral ecology and sociobiology emerge as explicit theoretical lenses, using cross-species observations of social structure, mating, and sex differences to explain adaptive strategies [2], [4], [5].

• Cross-domain expansion into plant and invertebrate biology demonstrates the generality of evolutionary reasoning beyond vertebrates, integrating ecology, morphology, and systematics [6], [9], [11], [15].