Mammals share certain traits, such as viviparity and lactation, because the common ancestor of this taxon had these traits. Studying such generalities about living mammals can give insight into particular mammalian species, such as ourselves. This is an example of reasoning by

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Reasoning by homology involves understanding similarities between organisms as resulting from a common ancestor, which is the case for mammalian traits such as viviparity and lactation.

Mammals Share Certain Traits, Such as Viviparity and Lactation, Because