By Alan Dale (Auth.)
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Successive stages (I, II, III) in the development of embryos of (a) tortoise ; (6) chick ; (c) pig ; and (d) man. The younger the embryos are, the closer they resemble one another, and the more they resemble the corresponding stage in the life history of a fish. ) which bear a distinct resemblance to the developing stages of animals on a lower plane of organisation, in many cases it certainly is true. The facts can easily be explained by the hypothesis that organisms have not been independently created, but have arisen as the modified MAN AND EVOLUTION 37 descendants of some previously existing forms ; in other words, that evolution has taken place.
Also, in the skulls of embryonic apes the heavy brow ridges, which are such a prominent feature of the adult, are undeveloped. They are absent in the adult man, where their function of acting as a bony buttress against the biting action of the lower jaw is taken over by the vertical wall of the frontal bone above the eyes. This vertical wall is, of course, absent in adult apes, where the forehead slopes sharply back from the eyes, though it is present in the embryos. These, then, are the main lines of evidence which suggest, though, of course, they do not prove, that man has been evolved from an apelike ancestor by processes which have resulted in the slowing up of the F I G .
50 SOCIAL BIOLOGY the jaw muscles of an echinoderm called Strongylocentrotus lividus, and in the Tornaria larva of Balanoglossus. Of course, the theory does not assume that the chordates are derived from any living form of Echinoderm, but imagines that they may have been developed from the freeswimming larva of some remote Echinoderm ancestor. A surprising fact which emerges from the study of evolution is that many patMOUTH terns of life which flourished abundantly in past ages no longer exist.