Step 1 : Introduction to the question " What did Lucy, the hominin skeleton found in 1974 in Ethiopia prove? "
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Lucy, an early hominid skeleton, of the Australopithecus afarensis, was discovered in Ethiopia in 1974. It is one of the first hominin fossils to become a household name. At the time, Au. afarensis was the oldest hominin species known, although far older species have since been found.
She is about 40% complete in her skeletal form, in her discovery, which was, at the time, one of the most complete fossils ever found. Forty seven of two hundred and seven bones have been found, mostly missing are the bones of the hands and feet. She was small, weighing between 25 to 60 kilograms.
Lucy and her species were capable of walking on two feet and the skeletal features indicate that she was used to that, regularly. However, she was not capable of walking sustained distances and it was not exactly in the way we humans do.
Anatomical features in the spine, pelvis, legs and feet indicate ability for upright walking. These include a broad pelvis and a femur that is angled inwards towards the knee so that the center of gravity lies directly above the foot. Lucy and her species also had vestiges of adaptations for climbing and hanging from trees. These features are seen in the shoulders, arms, wrists and hands. The small skull, long arms and conical ribcage were apelike, while the spine, pelvis and knees were more human.
The nickname Lucy came from the Beatles song "Lucy in the Sky with Diamonds," often played by the anthropologists.
More Info:
www.nhm.ac.uk
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