Evidence of Evolution. Chapter 11. 11.1 Impacts/Issues Reflections of a Distant Past. Events of the ancient past can be explained by the same physical, chemical, and biological processes that operate in today’s world. From Evidence to Inference.
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A A 30-million-year-old fossil of Elomeryx. This small terrestrial mammal was a member of the same artiodactyl group that gave rise to hippopotamuses, pigs, deer, sheep, cows, and whales.
Fig. 11-7a, p. 202
B Rodhocetus, an ancient whale, lived about 47 million years ago. Its distinctive ankle bones point to
a close evolutionary connection to artiodactyls. Inset: compare a Rodhocetus ankle bone (left) with that of a modern artiodactyl, a pronghorn antelope (right).
Fig. 11-7b, p. 202
C Dorudonatrox, an ancient whale that lived about 37 million years ago. Its artiodactyl-like ankle bones (left) were much too small to have supported the weight of its huge body on land, so this mammal had to be fully aquatic.
Fig. 11-7c, p. 202
Fig. 11-12, p. 208
limbs with 5 digits
Fig. 11-13d, p. 209