Two individuals of opposite sex are members of the same species if they:

Question

Quizplus · Accepted Answer

The ability to produce fertile offspring is the defining characteristic of members of the same species, as it indicates that they share enough genetic information to create viable offspring. Looking similar or behaving similarly may be indicators of membership in the same species, but they are not definitive. Sharing genetic information is important, but not sufficient on its own to indicate species membership.

Two Individuals of Opposite Sex Are Members of the Same