Respuesta :
The factor used in classifying two species into the same group is D. The species have the same set of traits.
What are traits in a orgaism?
Character traits csn be regarded as the valued aspects of a organism behavior.
When making classification, especially two species into the same group, traits serves as important factor because it list the characters in the organism.
Learn more about traits at:
https://brainly.com/question/25280941