You see, Darwin went far beyond such observable changes. He wrote in his famous book The Origin of Species: I view all beings not as special creations, but as the lineal descendants of some few beings.
ಡಾರ್ವಿನನು, ನೇರವಾಗಿ ನೋಡಸಾಧ್ಯವಿರುವಂಥ ಅಂತಹ ಬದಲಾವಣೆಗಳಿಗಿಂತ ಮುಂದಕ್ಕೆ ಹೋದನು.