Evolution: Online Course for Teachers: Session 5- Explain Part A

Human evolution is believed to have occurred over the past six million years. As you explore 14 hominid species in the Origins of Humankind Web activity, jot down the answers to these questions:
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When did bipedalism evolve in time (mya)? Which species was the first early bipedal hominid? What specific evidence supports bipedalism for early hominids? Which early hominid fossils provide the strongest evidence of bipedalism?
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When did the first evidence of tool use appear? In what species?
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Which was the first hominid to leave evidence of culture? What clues did hominids leave behind that reflected their cognitive abilities?
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What cultural adaptations allowed Homo erectus to expand beyond tropical and subtropical environments into the cooler climate of the temperate zone?
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Which hominids coexisted in time? Why and how do you think this was possible?
New technologies have allowed paleontologists to reexamine earlier fossil finds. Recently scientists were able to recover mitochondrial DNA from Neanderthal skeletons. That molecular evidence, based on a very small sample, differed from modern human DNA and suggests that Neanderthals and modern humans probably did not interbreed. There are still many questions about the details of the human phylogeny, especially with ongoing announcements of new species, some of which are believed to occupy new branches on an already bushy evolutionary tree. In paleontology, as in any scientific field, we need to reexamine and revise old hypotheses as new evidence emerges.