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Take home 3 - Essay Example

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1.A) A primate with abicondylar angle, an inferiorly placed foramen magnum, a reduced nonopposable thumb, a higher arch on the foot, a larger femoral head diameter show that it was bipedal. The advantage of bipedalism is that it allows the animal a better field of view by way of…
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Take home 3

Download file to see previous pages... Its disadvantage is that it is slow and unstable and exposes vital organs to danger. In this way, the speeds attained by those species with bipedal abilities are far below those attained by the species that essentially use all limbs. Ostriches are among the fastest of bipeds even though their speeds do not compare well with those for quadrupeds.Bipedalism evolved due to the need to to free the hands for using tools as man and other animals evolved.
B) When closely studied, the fossils of both Australopithecus anamensis and Australopithecus afarensis show that they were bipedal. In those records, all evidence in their knees, hips and foot morphology points to their having been bipedal.When compared to a modern human foot, the footprints called Laetoli Tracks in Tanzania point to a non-opposable hallux and an arch similar to that of a human being. Another piece of evidence displayed is that of the 7 Ma cranium which has an inferior placement of the foramen magnum which suggested that it was bipedal. The tibia of these species also had right angles between the shaft and the proximal surface which are evidence of bipedalism. These earlier hominids, though, are said to have been in the early stages of bipedalism given that further evidence has pointed to their using all four limbs especially for movement.
2.A) a) Orrorintugenensiswas discovered in Tugen Hills in Kenya in 2000. It is estimated to be between 5.7 to 6.1 million years old. Orrorin was bipedal given that its lesser trochanter protruded medially. From the evidence gathered about this hominid, its primary diet must have consisted of leaves and other forms of vegetation.
b) Sahelanthropustchadensiswas discovered in 2001 in the Djurab Desert of Chad and was estimated to be about 7 million years. It was bipedal given that the shape of the anteriorly placed foramen magnum bore signs of bipedalism. More evidence points to it having ...Download file to see next pagesRead More
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