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A synapomorphic (derived) character is defined as a trait that multiple taxa and their last common ancestor possess, but that the ancestor of this last common ancestor did not possess. The multiple taxa in this case could be the 29 orders of mammals, all of which have fur. All mammals descend from cynodonts. It is probable that cynodonts were covered in fur. Cynodonts evolved (with various steps in between) from early amniotes, which did not have fur. We do not know when exactly fur appeared in the evolution of mammals.

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Q: The mammal trait of having fur is an example of a derived character because?
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