Why is the Great Rift Valley so critical to the study of human evolution?

watch the video and address those questions,remember to include the number for each questionhttps://www.youtube.com/watch?v=NEz2TfqTCkk&feature=youtu.be1) The video explored multiple lines of evidence (fossils, comparative anatomy, morphology, life history, etc) for human evolution. Describe how two or more of these lines of evidence supported each other.2) Why is the Great Rift Valley so critical to the study of human evolution?3) Technology is increasingly important in evolutionary science. Discuss how a modern technique was applied to answer a research question in the video.4) Explain how we know the environmental conditions that existed at the time of early hominins.