. Principles of modern biology. Biology. 558 - Heredity and Evolution. Fig. 29-3. Human embryos: A, 26 days after ovulation (note particularly the gill slits, yolk sac, and tail). B, 34 days (note the limb buds, eye, and brain). C, 43 days (note the well-developed face and limbs and the umbilical cord). D, 56 days. In A, the magnification is some five times greater than in D. (Courtesy of Dr. G. W. Corner, Carnegie Institution of Washington.) human blood; while the bloods of New strated (Fig. 29-5); similarly all birds are World monkeys and lemurs (Fig. 29-4) show found to have a fairly close
. Principles of modern biology. Biology. 558 - Heredity and Evolution. Fig. 29-3. Human embryos: A, 26 days after ovulation (note particularly the gill slits, yolk sac, and tail). B, 34 days (note the limb buds, eye, and brain). C, 43 days (note the well-developed face and limbs and the umbilical cord). D, 56 days. In A, the magnification is some five times greater than in D. (Courtesy of Dr. G. W. Corner, Carnegie Institution of Washington.) human blood; while the bloods of New strated (Fig. 29-5); similarly all birds are World monkeys and lemurs (Fig. 29-4) show found to have a fairly close relationship to a less and less intimate relationship. In this each other, and more distant ties to members way many degrees of relationship between of the reptile group (Fig. 29-6). All in all, the bloods of all mammals can be demon- more than a thousand animals, in several ilif-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marsland, Douglas, 1899-. New York, Holt, Rinehart and Winston
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