Bahá’í World Faith, page 109 by ‘Abdu’l-Bahá
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and others afterwards. This priority does not prove that the later fruit of one tree was produced from the earlier fruit of another tree.
Secondly, these slight signs and traces of members have perhaps a great reason of which the mind is not yet cognizant. How many things exist of which we do not yet know the reason! So the science of physiology, that is to say the knowledge of the composition of the members, records that the reason and cause of the difference in the colors of animals, and of the hair of men, of the redness of the lips, and of the variety of the colors of birds, is still unknown; it is secret and hidden. But it is known that the pupil of the eye is black, so as to attract the rays of the sun; for if it were another color, that is, uniformly white, it would not attract the rays of the sun. Therefore, as the reason of the things we have mentioned is unknown, it is possible that the reason and the wisdom of these traces of members, whether they be in the animal or man, are equally unknown. Certainly there is a reason, even though it is not known.
Thirdly, let us suppose that there was a time when some animals, or even man, possessed some members which have now disappeared; this is not a sufficient proof of the change and evolution of the species. For man, from the beginning of the embryonic period till he reaches the degree of maturity, goes through different forms and appearances. His aspect, his form, his appearance, and color change; he passes from one form to another, and from one appearance to another. Nevertheless, from the beginning of the embryonic period he is of the species of man; that is to say, an embryo of a man, and not of an animal; but this is not at first apparent, but later it becomes visible and evident. For example, let us suppose that man once resembled the animal, and that now he has progressed and changed; supposing this to be true, it is still not a proof of the change of species; no, as before mentioned, it is merely like the change and alteration of the embry