In the following sentence, from which following aspects does the sentence extend the definition? “The snow leopard (Panthera uncia) is a feline, which lives in central Asia. It used to be thought not to be closely related to the smaller leopard, which is why they were put in different genera before. However, recent research has discovered this is not correct. The cat is closely related to the other big cats in the genus Panthera.”
选项：
Genres.History.Features.Explanation.