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I had an issue wih your statement that humans are labeled as human solely based on their ancestors. I simply don't understand how a speciation event can be marked if a species is based on their parents rather then their attributes. I don't understand how it is rational to argue that humans are humans because their ancestors were humans when our ancestors were only human, relatively recently. I think a large part of what Darwin was saying was based on the attributes of a species as being an important marker of different species. I am just still confused about how that statement works in tandem with what Darwin was positing.