The trait that determines whether two animals belong to the same species is their ability to breed with one another. The correct option is B.
What are traits?
Traits are also called characters, which are both, physical traits and internal traits. The traits of the organisms from the same species are also different due to variation.
If the organism can breed and produce fertile offspring, then they can be said to be of the same species.
Thus, option B. Their ability to breed with one another is correct.
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