Synapomorphies are both evolutionary innovations and shared, derived traits. Synapomorphies are used in determining relationships among animal groups.
Synapomorphies implies that a trait, homologous trait, is same in both organisms was inherited from the same ancestor. They are important because they constitute evidence of common ancestry. It can help scientists determine which group of animals are related and which aren't.
One such example of synapomorphies in mammals are the presence of mammary glands.
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