Which statement best explains why wing venation is used in taxonomic keys?

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Wing venation provides reliable, observable characters that help distinguish insect groups. The pattern of veins, including which veins are present or absent, how they branch, where they intersect, and the shapes of wing cells, tends to be characteristic for a lineage and remains fairly consistent within groups. Because of that, taxonomic keys use wing venation patterns to separate taxa and guide identification, making it a practical and informative feature to compare against reference specimens. While variation within species and wear on wings can blur details, venation is still a valuable tool when used alongside other characters. The idea that wing venation is irrelevant, only fossil, or something to ignore in identification isn’t accurate, since venation is common in living insects and frequently diagnostic.