The URL below has an excellent explanation of the two most used classification systems. To find how a particular shark is classified, do an Internet search.
This is a interesting subject (at least to me, I’m an information scientist), because although people tend to treat one of these two classification systems as “correct”, there are actually a lot of other ways to classify animals. “Nearness” in the tree does not necessarily mean “similar” in every respect. For example, there are both plants and animals that use the same system to glow-in-the-dark … and obviously those aren’t very close on either the Linnaean Systen of the Phylogenetic Classification System!
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