Some Ans. Questions 2014 by -'Abdu'l-Bahá- 1 Para

Thirdly, even if we were to suppose that certain animals, or even man, once possessed limbs which have now disappeared, this would not be a sufficient proof of the transformation of the species. For man, from the conception of the embryo until the attainment of maturity, assumes different forms and appearances. His appearance, form, features, and colour change; that is, he passes from form to form and from appearance to appearance. Yet, from the formation of the embryo he belongs to the human species; that is, it is the embryo of a man and not of an animal. But at first this fact is not apparent; only later does it become plain and visible (49:6)

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