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Weighing the Evidence One of the core propositions of biological evolution is that organisms alive today can be traced back through time to a common ancestor. Evolutionary biologists assert that the more similar organisms are genetically, the more closely related they are, and the more likely they are to have evolved from a recent common ancestor. In this activity, you will be considering whether the data you review supports the hypothesis that humans and chimpanzees share a common ancestor. You will review each data set with your team members. After you review each data set, consider with your team members whether you think that data set supports the hypothesis. Then record in the chart how confident you are that the hypothesis is true based on the evidence. With each new data set you review, record your confidence level based on all the evidence you have reviewed to that point. 
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