"Lucy," a 3.2 million-year-old female hominid of the species Australopithecus afarensis, was discovered by scientists in Ethiopia's Afar Depression. An unprecedented 40% intact, Lucy was the first fossil hominid to really capture public notice. Although she was 3 feet, 8 inches tall and looked somewhat like a chimpanzee, her bipedal knee structure indicates that she walked upright, like a human. What other human skeletal features did she possess? Discuss