But even when in the womb of the mother and in this strange form, entirely different from his present form and figure, he is the embryo of the superior species, and not of the animal; his species and essence undergo no change. Now, admitting that the traces of organs which have disappeared actually exist, this is not a proof of the impermanence and the nonoriginality of the species. At the most it proves that the form, and fashion, and the organs of man have progressed. Man was always a distinct species, a man, not an animal. So, if the embryo of man in the womb of the mother passes from one form to another so that the second form in no way resembles the first, is this a proof that the species has changed? that it was at first an animal, and that its organs progressed and developed until it became a man? No, indeed! How puerile and unfounded is this idea and this thought! For the proof of the originality of the human species, and of the permanency of the nature of man, is clear and evident.
(‘Abdu’l-Bahá, Some Answered Questions, p. 183)