ANTH 101 Recitation 4 - Ancestral Humans

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Minnesota State University, Mankato *

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101

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Anthropology

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Apr 3, 2024

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docx

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Uploaded by MajorFire13706

ANTH 101: Recitation Four: Ancestral Humans Name: Due: 11:59pm on Friday, February 9th, 2024 Section: Part one: Discovering Ancestral Humans Watch the following short clips before answering the questions below. Watch: Becoming Human: Evidence of Bipedalism 1. Approximately how many times longer did the group of “small brained, bipedal apes” live than Homo sapiens have? 25 times longer. Watch: Understanding the Gap in Human Evolution 2. According to the video, what is the greatest mystery that Paleoanthropology is facing today? We don’t know what happened between the gap of Australopithecus and early homo. Watch: The Discovery of Homo naledi 3. What made excavating in the Rising Star cave system difficult? The entrance is very difficult, it's around 7 and a half inches wide and comprised of sharp rock.

Part Two: Comparative Anatomy Answer the questions for each of the listed hominin species. Compare the pelvis of a Pan troglodytes (Chimpanzee), Australopithecus afarensis (Lucy), and Homo sapiens sapiens (modern humans) 1. Which two species have a similar pelvis? Lucy and the modern human a. Why might this be? We both walked/ walk upright 2. Look down the pelvis (towards the feet, through the hole). What shape does the hole make? Which two species share a similar shape? The chimps make a circle while both Lucy and Us make a heart shape. a. Why might this be? It also might allow us to walk upright and keep our balance without having to use our arms. Compare the femur of a Pan troglodytes (Chimpanzee), Australopithecus afarensis (Lucy), and Homo sapiens sapiens (modern humans). 3. How would you describe the orientation of the femur (does it appear straight up and down or angled) for each species? For the chimps, the femur is straight up and down while for lucy and us, the femur is at an angle and the modern humans is more of an angle than lucy. a. Why might this be different in each species? It shows how we’ve developed to walk. 4. Is there a curve in any of the femurs? There is a curve in Lucy’s femur

a. If so, in what direction? It curves right to left, top to bottom. b. Does this differ across the species? The human femur curves from right to left but as it goes down it curves the other way while the chimp femur curves in one direction the whole way.

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ANTH 101 Recitation 4 - Ancestral Humans

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