Mammals share certain traits, such as viviparity and lactation. Studying generalities about many living mammals can give insight into particular mammalian species, such as ourselves. This is an example of

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Reasoning by homology involves the comparison of similar traits among different species due to common ancestry. In this case, the shared traits of viviparity and lactation among mammals indicate a homology, suggesting that all mammals descended from a common ancestor that possessed these traits. This can help to better understand specific attributes of particular mammals, such as humans.

Mammals Share Certain Traits, Such as Viviparity and Lactation