Taxonomic classification of two organisms as members of the same order indicates they are also members of which higher taxonomic level?

• A. Genus
• B. Phylum
• C. Family
• D. Species

Answer: (B)

The key idea is how biological classification is organized in a nested hierarchy. An order is a middle rank: it sits below class and above family. If two organisms share the same order, they must also be in the same class and the same phylum (and the same domain and kingdom), because those broader groups contain that order.

Among the given options, the highest level that must be shared when two organisms are in the same order is the phylum. The other levels listed—genus, family, and species—are lower down in the hierarchy, and sharing an order does not guarantee that those more specific levels are the same. In other words, organisms can belong to the same order but belong to different families and genera, and certainly be different species.