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| Description: The traits that are labeled at each hash mark on this tree are synapomorphies shared by the descendant species above that point. For example, birds have feathers and other shared, derived traits that identify them as birds. But they also have four limbs that identify them as a member of the monophyletic group called Tetrapoda, amniotic eggs that identify them as members of the clade called Amniota, and so on.
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