Missing Link

The lost link of Darwinian theory is itself a proof that man is not an animal. How is it possible to have all the links present and that important link absent? Its absence is an indication that man has never been an animal. It will never be found.
(‘Abdu’l-Bahá, The Promulgation of Universal Peace, p. 358-359)

… the philosophers of the West have certain syllogisms, or demonstrations, whereby they endeavor to prove that man had his origin in the animal kingdom; that although he is now a vertebrate, he originally lived in the sea; from thence he was transferred to the land and became vertebrate; that gradually his feet and hands appeared in his anatomical development; then he began to walk upon all fours, after which he attained to human stature, walking erect. They find that his anatomy has undergone successive changes, finally assuming human form, and that these intermediate forms or changes are like links connected. Between man and the ape, however, there is one link missing, and to the present time scientists have not been able to discover it. Therefore, the greatest proof of this western theory of human evolution is anatomical, reasoning that there are certain vestiges of organs found in man which are peculiar to the ape and lower animals, and setting forth the conclusion that man at some time in his upward progression has possessed these organs which are no longer functioning but appear now as mere rudiments and vestiges.
For example, a serpent has a certain appendage which indicates that at one time it was possessed of long limbs, but as this creature began to find its habitation in the holes of the earth, these limbs, no longer needed, became atrophied and shrunk, leaving but a vestige, or appendage, as an evidence of the time when they were lengthy and serviceable. Likewise, it is claimed man had a certain appendage which shows that there was a time when his anatomical structure was different from his present organism and that there has been a corresponding transformation or change in that structure. The coccyx, or extremity of the human spinal column, is declared to be the vestige of a tail which man formerly possessed but which gradually disappeared when he walked erect and its utility ceased. These statements and demonstrations express the substance of western philosophy upon the question of human evolution.
The philosophers of the Orient in reply to those of the western world say: Let us suppose that the human anatomy was primordially different from its present form, that it was gradually transformed from one stage to another until it attained its present likeness, that at one time it was similar to a fish, later an invertebrate and finally human. This anatomical evolution or progression does not alter or affect the statement that the development of man was always human in type and biological in progression. For the human embryo when examined microscopically is at first a mere germ or worm. Gradually as it develops it shows certain divisions; rudiments of hands and feet appear—that is to say, an upper and a lower part are distinguishable. Afterward it undergoes certain distinct changes until it reaches its actual human form and is born into this world. But at all times, even when the embryo resembled a worm, it was human in potentiality and character, not animal. The forms assumed by the human embryo in its successive changes do not prove that it is animal in its essential character. Throughout this progression there has been a transference of type, a conservation of species or kind. Realizing this we may acknowledge the fact that at one time man was an inmate of the sea, at another period an invertebrate, then a vertebrate and finally a human being standing erect. Though we admit these changes, we cannot say man is an animal. In each one of these stages are signs and evidences of his human existence and destination. Proof of this lies in the fact that in the embryo man still resembles a worm. This embryo still progresses from one state to another, assuming different forms until that which was potential in it—namely, the human image—appears. Therefore, in the protoplasm, man is man. Conservation of species demands it.
(‘Abdu’l-Bahá, The Promulgation of Universal Peace, p. 358-359)